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 referring to the USDA zone info for Franklin you will be able to figure out when it's a good idea to plant helianthemum.

Planting Calendar for Helianthemum

Frost tolerance for helianthemum:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

You can plant helianthemum a little earlier in the year because they do well in moderate cold.

The earliest that you can plant helianthemum in Franklin 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 helianthemum and expect a good harvest is probably September. You probably don't want to wait any later than that or else your helianthemum may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your helianthemum indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Franklin. You can expect an average low temperature of -15°F in the coldest months of winter.

Since the USDA zone info for Franklin may not be accurate from year to year the actual date of last frost will vary from year to year. Half of the time in Franklin you get a frost after April 15 so just be sure to be ready to protect your helianthemum in the event of a late frost.

USDA Zone Info for Franklin

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Franklin

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