Absolutely – but fertilizing works a bit differently in an Eco Garden because of the water reservoir. We recommend avoiding liquid fertilizers as they can leave behind a salt and mineral build up in the soil. We recommend a high quality, dry granular fertilizer (some users prefer Organic – but as long as it is high quality you should be okay). We also recommend removing your garden soil every year, adding a bit more compost, and mixing a dry fertilizer into your garden soil in the spring (or whenever you decide to put it back in the garden). This will help keep your soil “fresh” and will help fertilize your plants appropriately.
Some experts even recommending a saturation watering once per summer – this is where you top water your Eco Garden until water comes out of the overflow drain. This can help flush unwanted leftovers from your soil and water reservoir.
We are also learning more about soil health and nutrients as we expand the distribution of our gardens. We recommend you test your soil health at least once per year. You can find soil test kits (pH, Nitrogen, Phosphorus, Potash) at your local garden supply store. We find that Nitrogen is used up most quickly and may need to be replenished (due mainly to the water running through the soil and into the reservoir – this is why some of your deep-root plants do so well and some shallow root plants may need more help).