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.

In Rancho Santa Margarita you can determine when it's the best time to plant helianthemum by reviewing the USDA zone info.

Planting Calendar for Helianthemum

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

Helianthemum are moderately cold tolerant which tells us that you can plant them a little bit earlier than more sensitive plants.

The earliest that you can plant helianthemum in Rancho Santa Margarita 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 grow to maturity. If you are starting your helianthemum indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost has passed is on January 31 in Rancho Santa Margarita. In the coldest months of winter you should expect an average low temperature of 30°F.

Keep in mind that USDA zone info for Rancho Santa Margarita is an average and the actual date of last frost is different every year. Since half of the time in Rancho Santa Margarita last frost occurs after January 31 be ready to protect your helianthemum if you have one of those late frosts.

USDA Zone Info for Rancho Santa Margarita

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°F

This means that on a really cold year, the coldest it will get is 30°F. On most years you should be prepared to experience lows near 35°F.

Plants to Grow in Rancho Santa Margarita

You may be interested in your other planting guides for Rancho Santa Margarita.