This is a test of commonsense. Complete the next sentence:

How to know what fertilizer to use on your garden plants and when to use it
Decide between organic and conventional fertilizer.
A broad and important choice you'll be confronted with is whether to use organic or inorganic fertilizer. Fertilizer not marked as " organic " is typically petroleum-based, and should not be used in organic gardens.
Organic fertilizer can come from many sources, including animals (e.g. manure), plants (e.g.