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 Williamsburg you can determine when it's possible to plant alternanthera by looking at the USDA zone info.

Planting Calendar for Alternanthera

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

It's not a good idea to plant alternanthera until after the last frost because they are not cold tolerant.

The earliest that you can plant alternanthera in Williamsburg 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 alternanthera and expect a good harvest is probably August. Any later than that and your alternanthera may not have a chance to grow to maturity. Starting your alternanthera indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is April 15 in Williamsburg. In the coldest months of winter you should expect an average low temperature of 5°F.

Since the USDA zone info for Williamsburg is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in Williamsburg you get surprised by a frost after April 15 so make sure that you are ready to cover your alternanthera if you have one of those late frosts.

USDA Zone Info for Williamsburg

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 Williamsburg

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