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.

By reviewing the USDA zone info for Alexandria it's a good idea to estimate when to plant bidens.

Planting Calendar for Bidens

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

Since bidens require warm weather you really should wait until after the last frost before you can plant them.

The earliest that you can plant bidens in Alexandria 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 bidens and expect a good harvest is probably August. Any later than that and your bidens may not have a chance to grow to maturity. If you are starting your bidens indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Alexandria. It might get as low as 5°F during the coldest months of winter.

Since the USDA zone info for Alexandria is just an average the actual date of last frost can change quite a bit from year to year. Half of the time in Alexandria it frosts late in the year after April 15 so be sure to be ready to cover your bidens in the event of one of those late frosts.

USDA Zone Info for Alexandria

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 Alexandria

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