Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A common way of figuring out when to plant pennyroyal is to check out the USDA zone info for Key Biscayne.

Planting Calendar for Pennyroyal

Frost tolerance for pennyroyal:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Pennyroyal do ok in quite a bit of cold which means that you can plant them earlier in the year than other frost tender plants.

The earliest that you can plant pennyroyal in Key Biscayne is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant pennyroyal and expect a good harvest is probably November. If you wait any later than that and your pennyroyal may not have a chance to really do well. You can get started a little bit earlier by starting your pennyroyal indoors.

Last Frost Date

In Key Biscayne it never frosts. You should expect an average low temperature of 40°F in the coldest months of winter.

It's important to remember that the actual date of last frost is just an average because it is based on the USDA zone info for Key Biscayne and it is different every year. Since it never frosts in Key Biscayne you do not have to be ready to protect your pennyroyal in the event of a late frost.

USDA Zone Info for Key Biscayne

Here is the info for USDA Zone 11a.

Average Date of Last Frost (spring)	Never
Average Date of First Frost (fall)	Never
Lowest Expected Low	40°F
Highest Expected Low	45°F

This means that on a really cold year, the coldest it will get is 40°F. On most years you should be prepared to experience lows near 45°F.

Plants to Grow in Key Biscayne

You may be interested in your other planting guides for Key Biscayne.