You can fertilize with organic fertilizers instead of chemical fertilizers.
You can also supplement with adding to the water -- used coffee grounds, left over tea, juice, milk, coconut water, and other beverages (when a container of beverage is empty, I add water and swish out the last dregs) and unsalted veg cooking/steaming water, a drop of unsulfured molasses, gelatin and agar, etc.
Keep in mind that they need nitrogen (think amino acids), phosphorous, potassium, calcium, magnesium, and other micro minerals.
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