An alternative is to use coconut coir and keep it always wet. The problem is that you have to get rid of the runoff to avoid accumulation of salts as you add fe

An alternative is to use coconut coir and keep it always wet. The problem is that you have to get rid of the runoff to avoid accumulation of salts as you add fertilizer to the water. This is not practical if you're watering every day unless you have special draining saucers.