In my experience they are ready anytime after the folliage has begun to decline. Green colored potatoes are not ready.
Pick
you pick it
the varations of colour on are straberry are red when they are ripe and white and green when not ripe the varations of colour on are straberry are red when they are ripe and white and green when not ripe the varations of colour on are straberry are red when they are ripe and white and green when not ripe
pick
Pick
In Canada we pick them In July when they are ripe.
Pick
pick it
pick it
When they are large enough or ripe.
You wait until they're ripe and press the A button when you're in front of them. If you can't tell when it's ripe, then press A anyway and on a day it is ripe you'll pick it. It's not that hard, really.
There are two ways to pick potatoes in RuneScape. First, you can pick them from a standard field, located in many cities in the game. The other option is to grow them yourself and pick them from your garden.