When the tops are about 10 - 12 inches.
About after 60 days.
Bulb onions are usually ready to be harvested in late summer, July or August. You can also tell if a bulb onion is ready to be harvested when flowers come from their stalks.
carrots are ready to harvest between 60 to 80 days. the carrot should be about half an inch in diameter.If you harvest a carrot carefully and it does not look ready, you may even be able to replant it!
That is the best time if it is ready to be harvested
When the husk opens they are ready.
papayas are ready to harvest when the unicorns say so
It is when food is ready to be harvested or picked from a field or garden.
Actually, radishes are roots. They are the root of the radish plant and, like carrots, are harvested mainly for their roots.
1-3 months depending on the species. My Chartenay Red Cored carrots will take 65-75 days, and others will usually take longer.
It means that the animal is ready to be harvested.
Corn is a grass, and the grains harvested from this plant grow above ground. Carrots are not a grass but a tap root, and it is the tap root that we like to eat. We do not eat the roots of corn.
Trees and animals stay ready to harvest and handle until you do. No time limit.