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1.General Information

1.1.Dimensions and Shipping

Dimensions: 50-plant model stands 44″ tall, is 26″ wide.
Weight: 36lbs “packaged weight” for shipping, +-200lb (185-205lb) loaded with 6+ cubic feet potting soil (well-watered)
Capacity: Holds 5-6 cubic feet of potting soil
Shipping: 23”x23”x25 Octagonal Box. Freight class 200.

1.2.Features

In most regions the tower can be planted in the spring with vegetables, flowers, and herbs, and again in late summer for the fall season. Temperate climates allow for three or even four complete crop cycles per year with proper planning.

The Garden Tower 2™ is 100% made in the USA.

Made from 100% food-grade materials.

High-impact HDPE (high-density polyethylene) body 100% is recyclable.

Food grade UV-inhibitor.

Food grade terracotta colorant.

Ruggedly overbuilt, lab quality consistency.

Five year warranty on manufacturing defects.

Replacement guaranteed.

1.3.Parts Description

Base: This is the bottom of the unit to which the feet are attached and the bottom ring is joined. It is also where the drawer slides in.

Bottom Ring: This attaches to the base and seals in the bearings. The first section of the compost column attaches to the base with subsequent sections being stacked on top.

Bearings: There are 43-54 nylon bearings. The Garden Tower 2™ can function fine on 13 bearings. We use many more than necessary to assure smooth and trouble-free functioning. Using more bearings creates a friction drag that makes rotating the unit difficult. The bearing track is formed by the joining of the base and bottom ring.

Compost Column: Each compost column consists of five perforated sections, one top solid compost column piece, and the cap. The compost column attaches to the center section of the bottom ring.

Grow Ring(s): These are the five sectional rings of the tower that create the pockets and comprise the body of the unit.

Drawer: This is the receptacle that slides into the base to catch the excess nutrient-rich runoff.

1.4.General Definitions

Vermicompost(ing): Vermicomposting is the process of maintaining a worm habitat by providing the right balance of moisture, bedding, and veggie scraps to decompose and sustain the worms.

Compost Column: This is the central column of the tower, intended for use in vermicomposting.

Soil Column: This is the growing area of the tower, inside the grow rings and surrounding the
compost column.

Organic Soil Amendment: This a natural fertilizer. It can be commercially prepared or a DIY mix of organic nutrients from various natural origins.

Compost Tea: This is the leachate or runoff that occurs and is collected in the drawer. When hydrating the tower, the water collects many of the nutrients provided by the worm manure. Any water not immediately absorbed by the soil will drain into the drawer at the bottom of the tower. Reapply this water quickly. Compost tea is significantly different from what is often known as worm tea though the terms are often used interchangably. The compost tea leachate from the tower can be directly reintroduced into the tower or used for gardens and houseplants, without dilution, since it is PH neutral. Traditional worm wea is concentrated and highly acidic. It can burn plants if used undiluted.

2.Basic Setup

2.1.Setup Tips

Zip Ties should be installed as shown in instructions PDF on page 6, step 13.

Location is important. A number of “failures” are due to too little light or poor watering. Choose a place that provides the most sun possible throughout the day, easy accessibility, and stability. It’s best to place your tower on a hard flat surface to avoid it sinking into the ground.

Start with a good, lofty, organic potting mix amended with a good supply of nutrients. Use a small bag of organic soil amendment (granular or time release) to mix in at every layer’s root zone, to give the plants and seedlings a good start until the compost column gets working. This is a key for a quick start to the growing season and easy maintenance down the road.

The tower works on an aerobic (“with air”) composting principal. Light, fluffy soil is best. Many issues occur due to over-compaction, either in the soil column or directly in the compost column. Straw, grass, leaves, and coir (fiber from the outer husk of the coconut) serve as great bedding for worms. These things are good to include periodically directly in the compost column to avoid compaction.

2.2.Soil

Good soil is critical for success with the Garden Tower 2™. It is essential to use quality organic, professional potting soil or mix meant for use in containers. A good, commercial organic potting soil (or “grower’s mix”) will optimize drainage, water retention, and aeration for both plants and the compost. We recommend you ask your nursery for a lightweight, fluffy grower’s mix or potting soil. Organic types are best, but not required. Many grower’s mixes are completely free of fertilizers.

Tip: Spend some time at a local garden center or talk to local gardeners about soils and what types of plants will do well in your area. Mention the amount of shade you have, the overall temperature, and other details.

2.3.Fertilizer

We recommend giving the plants an organic soil amendment boost in the beginning while the compost column starts working. As the central compost column begins to produce its own fertilizer, this will no longer be necessary.

Soil amendment can be commercially prepared or it can be a DIY mix of organic nutrients from various natural origins. You can also purchase a plant food to fortify your soil mix, mix with your soil, or kickstart the movement of nutrients through the tower.

Here are some tips for using commercially prepared products:

  • Use an organic plant food which is not manure-based. Adding this to the soil makes nutrients immediately available in the system. OMRI Certified is best.
  • Liquid organic plant food mixtures will provide a lot nutrition to young plants, but have to be periodically reapplied.
  • Granular types of amendment are time-release and will provide nutrients for about three months.
  • Make sure to purchase a naturally-derived plant food.
  • We recommend staying away from animal manure products as they have an overabundance of salts.
  • Your amendments should not contain DPW (Dehydrated Poultry Waste), municipal sludge
    (typically labeled as bio-solids), or petrochemically-derived fertilizers (salts).
  • The application rate for a general purpose organic 4-4-4 is up to 1 cup per cubic foot of soil.

3.Tower and Compost Setup

3.1.Tower Setup

This setup method helps prevent the soil mixture from settling too far below the edge of the Garden Tower 2™ over time, and gives you a sense of how much water it takes to achieve full hydration without overflowing the drawer.

For how to install zip ties, see p. 6, step 13 in the instructions.

Use a light, organic, professional potting mix. Before or at the last frost date you may plant seeds of cool weather crops or even transplants.

Mix in a small bag of high quality soil amendment with the initial potting soil to give the seeds and transplants a good start until the compost column is working.

Build and fill the tower approximately 1/3 at a time. Start with the bottom ring and the 2 grow rings. Place 3 compost column pieces and place the cap on the compost column to keep dirt from pouring in. Fill this with potting mix.

Add soil amendment in a ring around the column and mix it into the soil.

Evenly pour 2-3 gallons of water from the top slowly on the soil until it starts dripping into the drawer. Count the containers of water or use a water meter to keep track of how much water you use for each level. The number of gallons the tower holds before dripping into the drawer tells you the water-holding capacity of your soil.

Add a couple of grow rings and compost column pieces. Replace the cap. Add more soil mixture until the next row or two of rings are filled. Add another handful of soil amendment and water. Continue to layer like a cake, sprinkling the organic soil amendment above the root zone of the levels and watering each, until the tower is full and water is dripping into the drawer.

Finish filling the last ring until it is filled about one inch from the top of the top ring. Reuse water from drawer as necessary. Evenly pour 3-4 more gallons of water from the top on the soil.

On setup, water the tower as above, hydrating each level until it is dripping into the drawer.

You should cover or protect the tower at night or when the temperature drops significantly.

3.2.Column Setup

Wait until after the last frost date to introduce worms into a new, recently emptied, or restarted tower. Composting worms can live outside of their comfort zone, although keeping temperatures between 55-65°F is optimal.

Get worms acclimated in a cooler area for 24-48 hours before moving into 50°F or colder temperatures to avoid shocking them. Temperatures fluctuate less in a working compost column, even when temperatures dip to freezing at night. A partially full column is slightly more sensitive to temperature.

Use 250-500 red wiggler worms to start, or 25-50+ earthworms.

Red wigglers go in the compost tube, and earthworms go in the soil column. You may release them anywhere on the tower and they will eventually make it to where they will do their best work.

3.3.Composting Glossary

Vermicompost: This is contents of the compost column. It may include unprocessed food scraps.

Castings: Worm castings are basically worm poop and known also as “finished compost”. They may be used as a soil amendment. Worm castings should only be 10-20% of the overall soil mix.

Browns: Browns include well-dried leaves and grasses, as well as shredded brown cardboard paper. This serves as bedding for the worms, but also becomes a food source, since it gradually breaks down. Bedding is another name for browns.

Greens: Greens are fresh veggie scraps suitable for composting.

3.4.Feeding

Here are a few tips for feeding the worms in your Garden Tower 2™.

The leading cause of death to worms by beginners is overfeeding, which is caused by excess moisture and water. The worms can’t keep up with the food supply. This causes their food to turn sour, acquire a nasty smell, and blocks oxygen from penetrating the compost.

Do not stuff the compost column, as good air circulation is important to the worms’ well-being. Overfeeding invites unwanted pests into your worm bin.

Generally, the worm bin will receive enough moisture from the food you put in. There is no need to ever water directly into the compost column.

Feed the worms a generous handful or two of food every couple of days and provide plenty of browns for bedding.

The wetness or dryness of a tower will vary from day to day. This is okay. You may not see worms. This is fine, as worms are good at hiding. They will move out of the compost column if they do not like the conditions, but they will move back in as soon as a balance is re-established.

3.5.Composting Tips

Compost performance will vary with the temperature. Worms will love your indoor Garden Tower 2™ habitat. Their activity, however, is directly related to temperature. Only add kitchen scraps as more space is generated within the composting column.

Certain things are difficult for the worms to eat and should be avoided. These include avocado pits, corn cobs, and other hard, dense objects. The smaller the scraps that you use, the faster the worms can make vermicompost.

Do not put any meats, fats, dairy products, string, or hair into the compost column.

3.6.Worm Types

Red Wigglers (eisenia fetida) are the workhorses of the compost column and the entire system overall. Earthworms, on the other hand, act as a supplemental soil conditioners. They clean up debris in the tower, spread nutrients, and aerate the soil column.

Red wigglers are voracious composters and live primarily in the compost column.

Earthworms are beneficial to add into the soil column as they are burrowers, earth movers, and vertical dwellers. They will eat materials in the soil, such as old root bits and other organic matter, and continually aerate it. This distributes nutrients throughout the system.

Earthworms can be harvested locally by looking under leaves or by leaving a wet carpet outside. After a few days, worms will collected on the carpet.

4.Planting

4.1.Planting Tips

Use these planting tips to help you reap a bountiful harvest from your Garden Tower 2™!

Four to five larger plants may be planted in the top.

Large plants such as tomatoes are a great choice for the top of the tower and can be trellised or staked many feet in the air. Plant tomatoes very deeply in the soil for steady access to water.

Trailing vines such as squash and zucchini do best on the bottom row. They require more floor space to accommodate their growth, but be aware that they will make your tower difficult to rotate.

If you have limited space, or wish to have the option of being able to rotate your tower, these types of plants may not be your best choice. Look for “bush” varieties of these vining or trailing veggies as they are more compact and much easier to grow in small spaces.

Pay attention to the space requirements of the plants you’re planning to grow and consider placing plants that require less space between plants that require more space.

Planting identical plants in diagonal columns or in small clusters of three to five generally performs well and looks beautiful.

You can begin with seed or small starts, available at garden centers and farmers markets. Start your seeds in soil in a compact flat or tray where they will grow into small starts for easy transplanting. Water your seeds with a misting sprayer.

When planting side pockets, start at the bottom row with your bushiest mature plants. Working up the rows, choose your next plants according to size as you plant. Choose plants of decreasing mature size as you plant from bottom to top. Check our companion planting guide to learn more about what plants grow well together.

4.2.Seed Selection

We suggest planting only non-GMO and heirloom varieties. Baker’s Creek is a great source of seeds. We also offer a gift certificate.

4.3.When to Plant

Planting times will be location dependent. Search online for “Last Frost Date” for the your location name, or consult our hardiness zone library.

4.4.Plant Selection

Here are a few general guidelines for planting in the Garden Tower 2™.

Plant 4-5 large, bushy plants in the top.

Determinate (bush variety) tomatoes, basil, eggplants, peppers, and beans do well in the top of the tower.

Cabbages, broccoli, cauliflower, radishes, and kohlrabi all do well in the lower and middle side pockets. Lettuce and spinach can be planted anywhere it will fit. Please study the Companion Planting Guide since space in the Garden Tower 2™ is compact. The root zones are very close together, and companion planting can have a positive impact on your planting.

Herbs such as cilantro and parsley can be interspersed with similar companions.

Flowers can be planted throughout and act as a beacon to beneficial insects. Marigolds are reported to be good for certain pest controls and Nasturtiums are delicate, beautiful, and the flowers are edible!

Vining plants, such as indeterminate tomatoes, squash, cucumber, and melons, should go in the bottom two rows of the tower. They should be trellised away from the tower to a railing, stool, chair, or other garden art. This prevents them from blocking sun from their neighbors, but make it hard to rotate the tower in the later part of the season.

If you are having issues growing a particular plant or variety, try looking for a container or bush variety of whatever type of plant that hasn’t grown well for you.

We recommend against planting strawberries and other woody-stemmed, vining (and potentially invasive) plants in the tower. Mints, for example, have a high nutrient density which makes it possible for them to take over other crops. In the following year or two you will have a big woody mess to cut out of the tower. The Garden Tower 2™ makes this chore a bit easier due to its sectional design.

4.5.Plant Suggestions

Vegetables: Amaranth (vegetable type), Arugula, Beans(Lima, bush, pole, shell, fava), Broccoli, Brussels Sprouts, Cabbage, Chinese Cabbage, Cauliflower, Chard, Chicory, Collards, Cucumbers, Dandelion, Eggplant, Endive, Escarole, Gourds, Kale, Leeks, Lettuce, Melons, Mesclun, Mustard Greens, Dwarf Okra, Peas, Peppers, Radicchio, Sorrel, Spinach, Squash, Strawberries, Tomatoes. Note that vines such as squash and melons grow nicely from the bottom holes, trailing on the ground.

Herbs: Angelica, Anise Hyssop, Basil, Calendula, Catmint, Catnip, Chamomile, Chervil, Chives, Cilantro (Coriander), Dandelion, Dill, Echinacea (Coneflower), Feverfew, Flax, Garlic Chives, Goldenseal Hyssop, Lavender, Fennel, Lemon Balm, Marjoram, Milk Thistle, Mint, Nettle, Oregano, Parsley, Passion Flower, Pleurisy Root, Rosemary, Sage, Salad Burnet, Saltwort, Savory, Shiso, Stevia, Thyme, Valerian, Wormwood.

Edible Flowers: Calendula, Carthamus, Dianthus, Marigolds, Nasturtiums, Pansies, Salvia, Violas.

Ornamental Flowers: Ageratum, Amaranth, Ammi, Aster, Bells of Ireland, Bupleurum, Morning Glory, Nigella, Petunia, Phlox, Polygonum, Poppy, Ptilotus, Rudbeckia, Safflower, Salpiglossis, Sanvitalia, Scabiosa, Snapdragon, Stock, Strawflower, Sweet Peas, Verbena, Yarrow, Zinnia.

5.Watering

5.1.Watering Tips

Maintain a regular watering schedule. Morning is best, afternoon is okay, evening is the least desirable.

Do not water your tower with a hose because as it is difficult to learn how much water your tower actually requires. Once you have more experience and know how much water your tower needs, you can get away with using a hose.

By watering with a container such as a 5 gallon bucket, you will learn how much water is ideal for your tower.

Do not get plants wet during the hottest part of the day, as this can cause them to become damaged.

During the active growing season, a good rule of thumb is to use 4-6 gallons of water every 2-3 days.

Test the soil for dryness by placing your finger in a pocket in the lowest row. If the soil feels dry, a heavier watering is required (5-7 gallons). If the soil feels slightly moist, maintenance watering is all that is required (2-4 gallons).

If water drains into the drawer more often than twice per week, you’re watering too frequently.

A layer of mulch on the top surface of the tower will help maintain constant moisture.

Tend to your garden as you would with a regular garden. Remove dead or damaged leaves, cut back on unruly growth, and replace harvested plants.

As a self-contained, self-fertilizing system, the Garden Tower 2™ requires relatively little care.

6.Extended Growing Season

6.1.Extended Growing Season Tips

You can get 2-3 weeks of extended growing on each side of the season! Because of the large thermal mass created by the volume of the Garden Tower 2™ body and soil, the seeds, starts, and plants are protected both in the spring and at harvest. In the spring, the tower heats up faster that the ground around it. This allows you to plant 2-3 weeks ahead of when you would normally plant in the ground. In the fall, you will be able to harvest 2-3 weeks later than similar plants in the ground.

If it’s going to get below 32°F, we suggest putting a piece of clear plastic over the tower, with stakes positioned to protect the plants. The plastic must be removed as soon as the sun comes out if it’s going to be above 32°F or your plants might get damaged. Garden fleece material or bags may be used to extend your season even further.

Here are a couple of products to try for light extended season or overwinter use:

For heavier cover and snow protection, try using NuVue Winter Wrap.

Put stakes in the tower to keep the cover off of the plants, and gather it around the bottom to secure it from the wind. If you are protecting worms during a severe cold snap, then darker plastic will absorb more warmth and provide more protection to the compost column.

6.2.Indoor Use

The Garden Tower 2™ is being used around the world in greenhouses, hoop-houses, sun-rooms, and indoors. The best placement indoors in the winter months is in front of a south-facing window. Depending on the amount of available light, supplemental lighting should be used.

Garden Tower 2™ setup is similar both indoors and out. Lighting is the biggest consideration. Setting up your tower one level at a time is especially important for indoor gardeners. As you hydrate each level, which helps it settle, count the number of gallons you use to water the entire tower. Water each level as you fill it until it drips. This will tell you the capacity of your soil column, so that you can fully water it without overflowing the reservoir drawer.

For an inexpensive lighting setup, use full-spectrum 40 watt CFL bulbs with standard reflective bulb fixtures. Better yet, use 40″ full spectrum fixtures. These can be mounted vertically using 2×4’s and stand alongside the tower. Also, using Mylar or foil film (a readily available source is emergency blankets) around the tower and lights will help increase the efficiency of the lighting. Pricier setups use High-Pressure Sodium/Mercury (HPS/HPM) lights. These have have heat and ventilation requirements and can be expensive to replace.

People often notice a mild odor for a few weeks after startup, but this fades as the compost matures and comes into balance. With proper composting practices, we have not had a single tower exhibit any sharp odors indicative of high acidity brought on by lack of oxygen.

You may wish to invest in casters (wheels) to make moving your tower easier.

7.Seasonal Maintenance

7.1.Emptying the Compost Column

We recommend that you empty a portion of the compost column when it is full of vermicompost. Here’s how to empty the column.

  1. Make sure that the worms have fully consumed all of the kitchen scraps.
  2. Make sure the drawer has no water in it.
  3. Pull the screen out half way to allow vermicompost to exit the bottom of the compost column, and fall into the drawer.
  4. Depending on the degree to which plants have rooted into the compost, it may be necessary to push the contents of the compost column out with a wooden broomstick or other handle.
  5. Clear the track if necessary and push the screen back in.

7.2.Reconditioning the Soil

After emptying part of the contents of the compost tube, remove the drawer and place vermicompost on top of the soil at the top of the tower. Your soil will have had time to settle a bit at this point, so it is recommend that you place a 1-3″ thick (or more) layer of vermicompost on top of the soil. Be careful not to exceed height of top ring section. Any excess vermicompost can be used on your house plants, garden flowers, given to a friend, or saved to rejuvenate the soil in your tower at a later date.

7.3.Overwintering the Garden Tower 2™

When winter arrives, you can move your tower to a heated location, or just leave it outdoors and replant in the spring. Flip the drawer over to prevent ice buildup.

Cover your tower when not in use.

  • The biggest factor affecting the longevity of the plastic body is degradation from ultraviolet radiation. The body is only exposed during the growing season for the first few weeks until foliage grows enough to shield the tower. During the winter the tower body is protected by foliage.
  • A dark, breathable, semi-permeable cover, especially in colder climates, will help the tower gather warmth throughout the day providing protection and insulation for the worms during cold and even sub-zero nights.
  • A cover can prevent the soil from drying out. Dry soil collapses and may lead to increased compaction when you start to use the tower again when the growing season starts.

7.4.Overwintering Worms

In middle and northern regions, overwintering is possible during mild winters. The Garden Tower 2™ can absorb enough heat during the day to carry it through nights in the low 20’s without the worm habitat dropping to dangerous temperatures. It takes at least several days and often up to a week or more of freezing and sub-zero days and nights to significantly affect the worm population.

The Garden Tower 2™ is a flexible and forgiving system, but every natural system has its limits. When overwintering the worms, we recommend that the tower is covered by a dark, semi-permeable material, such as a grill cover or landscape cloth. The dark material will help the tower absorb heat during the day, even if it is only slightly above freezing. We have covered one with a light plastic sheet and were harvesting chives, cilantro, and parsley well into December, despite several snowfalls with over 8″ accumulation. The worms were still alive in the tower, but as there were ice crystals forming in the compost, we knew another cold snap would do them in. Fearing a harsh winter we removed some worms from the tower to overwinter in a bin in a semi-heated garage. It made composting in sub-zero temperatures easy because we didn’t have to trek out to the towers, or to the compost pile.

We suggest that during very cold winters, the compost in the central tube should be removed, worms and all, and placed in a 1 foot (or more) deep hole in the ground outside. Fresh kitchen scraps can be added and a 8″ layer of straw will ensure the worms don’t freeze. If you live in an apartment, you can overwinter the worms inside in a small bin. All of this may be unnecessary if the Garden Tower 2™ is near a building, on a patio, porch, or near a wall, as it is unlikely to actually freeze because of the substantial thermal mass of soil.

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