Assuming you are talking about Pelargoniums (what is typically grown as an
annual bedding plant in the temperate zones), not the hardy perennial, if
you are growing them in containers the rule of thumb is to apply liquid
fertilizer every 10 days, every 14 days if you have planted them in the
ground. I'm also assuming you didn't plant them in containers with
store-bought potting soil that already contained fertilizer.
Also, what do you mean by "adequate" water? One of the nice things about
Geraniums is that they are quite drought tolerant. They are one of those
plants that you really don't need to (and probably shouldn't) water unless
the top inch of the soil is bone dry. Then give them a thorough soaking.
Bear in mind that if you have them in a container, this could still mean
having to water them daily, depending on how crowded they are.
They are in a large container. The plants themselves are twice the
size they were when I originally purchased them - so I must be getting
some part of it right. I'll try fertilizing the next time they are
due for watering and see if that helps.
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