One of the first steps you take when you are getting a good idea your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By referring to the USDA zone info for Roma you should be able to figure out when you can plant cuphea.

Planting Calendar for Cuphea

Frost tolerance for cuphea:	Not tolerant of frost.
When to plant:	After the last frost.

It's probably not a good idea to plant cuphea until after all chance of frost has passed because they do not do well in cold weather.

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

The last month that you can plant cuphea and expect a good harvest is probably September. Any later than that and your cuphea may not have a chance to fully mature. You can get started a little bit earlier by starting your cuphea indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in Roma. You can expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Roma is just an average the actual date of last frost will vary from year to year. Since half of the time in Roma it frosts late in the year after February 15 be ready to protect your cuphea if you have a late frost.

USDA Zone Info for Roma

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Roma

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