Green capsicums are harvested before they are fully ripe. They will continue to first turn yellow and then red if they are left on the plant to mature. They have a slightly bitter flavor and will never have the sweet taste of their red, yellow and orange counterparts.
Store capsicums in plastic bags and they will keep up to five days in a fridge. The green capsicum will keep slightly longer than the other, more ripe, varieties. They should not be stored near ethylene-producing food such as pears or apples! Also suitable for home freezing.