One of the first steps you take when you are figuring out your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Marysville should be reffered to in order to estimate when it's the best time 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.

Helianthemum can survive in some cold which means that you can plant them a little bit earlier in the year than more sensitive plants.

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

The last month that you can plant helianthemum and expect a good harvest is probably October. If you wait any later than that and your helianthemum may not have a chance to fully mature. You can get started a little bit earlier by starting your helianthemum indoors.

Last Frost Date

The average date of last frost is February 15 in Marysville. In the coldest months of winter you can expect an average low temperature of 25°F.

Since the USDA zone info for Marysville is an average the actual date of last frost will vary from year to year. Since half of the time in Marysville there is a last frost after February 15 be ready to cover your helianthemum if you have a surprise late frost.

USDA Zone Info for Marysville

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Marysville

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