For success in the Garden Tower system, good soil is critical. Using a quality organic “professional potting” soil or mix, meant for containers is essential. 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 or fluffy grower’s mix or potting soil (organic is best but not required). Many “grower’s mixes” do contain some slow release fertilizer which will help your plants get going while your worms settle into their new environment. Some potting mixes may be completely free of fertilizers so please read the below Soil Amendment note.
If your potting mix does not contain any in-built fertilizer, we recommend giving the plants a boost in the beginning (until the compost column gets working) by using some organic soil amendment. As the central compost column begins to produce its own fertilizer, this will no longer be necessary.
Soil amendment can be commercially prepared or a DIY mix of organic nutrients from various natural origins. If purchasing a plant food to fortify your soil mix, mix with your soil to kick-start the movement of nutrients through the Tower.
Commercially prepared products should be: