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

You should be able to determine when to plant cuphea by using the USDA zone info for Riverside.

Planting Calendar for Cuphea

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

It's probably a bad idea to plant cuphea until after the last frost because they are not cold tolerant.

The earliest that you can plant cuphea in Riverside 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 really do well. You can get started a couple of weeks earlier by starting your cuphea indoors.

Last Frost Date

The average date of last frost is February 15 in Riverside. You should expect an average low temperature of 25°F in the coldest months of winter.

Always keep in mind that USDA zone info for Riverside is not always accurate and the actual date of last frost will vary from year to year. Half of the time in Riverside you get surprised by a frost after February 15 so always be ready to protect your cuphea in the event of a surprise late frost.

USDA Zone Info for Riverside

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 Riverside

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