Not everyone is as sensitive to heat like my red-haired man, (who survived his ordeal, thank goodness!) because everyone has a different palette. But in general, it's a warning, the pepper berries and leaves are hot.
The pepper berries are ready to harvest in March, but the leaves are always available for use in cooking. And are always hot. To get berries you will need a male and female plant, but only the females have the berries.
I have found using the pepper leaves in cooking, it's best to add just a little before serving soups etc., to get that extra punch. But not too much, as we don't want your guests to be like my red-haired man. Pepper Berry used in conjunction with fruit, brings out the flavour of fruits, and is really worth a try, like chilli and chocolate, unusual, weird, but amazing. Play around with the flavour and have fun.