Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Sullivan you can figure out when it's possible to plant hardy hibiscus by reviewing the USDA zone info.

Planting Calendar for Hardy Hibiscus

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

Hardy Hibiscus do well in quite a bit of cold which means that you can plant them earlier in the year than other plants that might not handle the cold.

The earliest that you can plant hardy hibiscus in Sullivan 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 hardy hibiscus and expect a good harvest is probably September. Any later than that and your hardy hibiscus may not have a chance to fully mature. You can get started a few weeks earlier by starting your hardy hibiscus indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Sullivan. It might get as low as 5°F during the coldest months of winter.

Since the USDA zone info for Sullivan is just an average the actual date of last frost changes from year to year. Since half of the time in Sullivan you get surprised by a frost after April 15 be ready to cover your hardy hibiscus if you have a late frost.

USDA Zone Info for Sullivan

Here is the info for USDA Zone 7b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	5°F
Highest Expected Low	10°F

This means that on a really cold year, the coldest it will get is 5°F. On most years you should be prepared to experience lows near 10°F.

Plants to Grow in Sullivan

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