One of the first steps you take when you are making a decision about 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.

In Detroit you can estimate when to plant cuphea by referring to the USDA zone info.

Planting Calendar for Cuphea

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

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

The earliest that you can plant cuphea in Detroit 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 cuphea and expect a good harvest is probably August. You probably don't want to wait any later than that or else your cuphea may not have a chance to really do well. You can get started a few weeks earlier by starting your cuphea indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Detroit. In the coldest months of winter you can expect an average low temperature of -5°F.

Keep in mind that USDA zone info for Detroit is not always accurate and the actual date of last frost changes from year to year. Half of the time in Detroit it frosts late in the year after April 15 so be sure to be ready to protect your cuphea in the event of a late frost.

USDA Zone Info for Detroit

Here is the info for USDA Zone 6b.

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

Plants to Grow in Detroit

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