Before planting it is a good idea to find your USDA Zone info to estimate 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.

The first opportunity to plant torenia in Charleston should be determined by referring to the USDA zone info.

Planting Calendar for Torenia

Frost tolerance for torenia:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

It's not a good idea to plant torenia until after the last frost has passed because they require warm weather.

The earliest that you can plant torenia in Charleston is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant torenia and expect a good harvest is probably August. If you wait any later than that and your torenia may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your torenia indoors.

Last Frost Date

The average date of last frost is April 15 in Charleston. In the coldest months of winter you should expect an average low temperature of 0°F.

Just be sure to remember that USDA zone info for Charleston is just an average and the actual date of last frost is different every year. Half of the time in Charleston you get surprised by a frost after April 15 so be sure to be ready to cover your torenia in the event of a late frost.

USDA Zone Info for Charleston

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Charleston

You may be interested in your other planting guides for Charleston.