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 figure out when you can plant bidens by referring to the USDA zone info for Norman.

Planting Calendar for Bidens

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

It's probably a bad idea to plant bidens until after the last frost because they require warm weather.

The earliest that you can plant bidens in Norman 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. If you wait any later than that and your bidens may not have a chance to really do well. You can get started a couple of weeks earlier by starting your bidens indoors.

Last Frost Date

The average date of last frost is April 15 in Norman. You should expect an average low temperature of 0°F in the coldest months of winter.

Since the USDA zone info for Norman is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in Norman it frosts late in the year after April 15 so make sure that you are prepared to cover your bidens if you have a surprise late frost.

USDA Zone Info for Norman

Here is the info for USDA Zone 7a.

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

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Norman

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