One of the best tools that you have as gardeners to help us figure out your gardening schedule is the 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.

One way of estimating when you can plant larkspur is to refer to the USDA zone info for Henderson.

Planting Calendar for Larkspur

Frost tolerance for larkspur:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Larkspur can survive in quite a bit of cold which tells us that you can plant them a lot earlier in the year than more sensitive plants.

The earliest that you can plant larkspur in Henderson is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant larkspur and expect a good harvest is probably September. Any later than that and your larkspur may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your larkspur indoors.

Last Frost Date

On average the last frost is on April 15 in Henderson. In the coldest months of winter you can expect an average low temperature of 5°F.

Keep in mind that USDA zone info for Henderson may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Henderson it frosts late in the year after April 15 so just be sure to be ready to cover your larkspur in the event of a late frost.

USDA Zone Info for Henderson

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 Henderson

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