Usage: HARVEST <garden keyword>
You can harvest a garden that is in the growing stage, but you'll only get a partial yield.
You can harvest a garden that is ready to be harvested in order to get a full crop.
If you skill fails, you may only get a partial crop. Any weeds present when harvesting will also deduct from the overall yield.
Once a garden is ready to harvest, it will stay that way for two real life days. After this time, it will reclaim itself, by tilling.
The soil gets worn after a while and will need to recover. When your soil is worn out, the garden must be left in the recovery phase for up to three real life days. The more you harvest, the more likely the soil will need to recover.
Tilling a ready-for-harvest garden, or letting it reclaim itself, will renew the soil immediately.