FAQ's for Kohlrabi

The kohlrabi I have picked so far are tough and bitter. What is wrong?

Can I eat the leaves of kohlrabi?

I find it hard to hoe weeds growing close to the kohlrabi—I’m afraid I’ll chop one of the kohlrabi stems. How can I keep weeds under control without damaging the plants?

Is there a secret to growing great kohlrabi?

Does kohlrabi need a lot of water?

They’re calling for frost tomorrow night. Do I need to pick the kohlrabi?