The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. 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 Phoenix it's possible to determine when it's the best time to plant trachelium.

Planting Calendar for Trachelium

Frost tolerance for trachelium:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

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

The earliest that you can plant trachelium in Phoenix 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 trachelium and expect a good harvest is probably September. Any later than that and your trachelium may not have a chance to fully mature. Starting your trachelium indoors is a great way to get them started a few weeks earlier.

Last Frost Date

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

Since the USDA zone info for Phoenix is not always accurate the actual date of last frost will vary from year to year. Since half of the time in Phoenix there is a last frost after February 15 be ready to cover your trachelium in the event of a late frost.

USDA Zone Info for Phoenix

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 Phoenix

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