One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By using the USDA zone info for Irmo you will be able to determine when you can plant liatris.

Planting Calendar for Liatris

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

Since liatris are very cold tolerant you can plant them much earlier in the year than more sensitive plants.

The earliest that you can plant liatris in Irmo is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant liatris and expect a good harvest is probably September. You probably don't want to wait any later than that or else your liatris may not have a chance to grow to maturity. Starting your liatris indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is March 15 in Irmo. You should expect an average low temperature of 10°F in the coldest months of winter.

Since the USDA zone info for Irmo is an average the actual date of last frost will vary from year to year. Half of the time in Irmo you get surprised by a frost after March 15 so always be ready to cover your liatris in the event of a late frost.

USDA Zone Info for Irmo

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°F

This means that on a really cold year, the coldest it will get is 10°F. On most years you should be prepared to experience lows near 15°F.

Plants to Grow in Irmo

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