Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A way of figuring out when you can plant erysimum is to examine the USDA zone info for Monrovia.

Planting Calendar for Erysimum

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

Since erysimum do well in moderate cold you can plant them a little bit earlier in the year than other frost tender plants.

The earliest that you can plant erysimum in Monrovia 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 erysimum and expect a good harvest is probably October. Any later than that and your erysimum may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your erysimum indoors.

Last Frost Date

On average the last frost has passed is on January 31 in Monrovia. It might get as low as 30°F during the coldest months of winter.

Keep in mind that USDA zone info for Monrovia is just an average and the actual date of last frost will vary from year to year. Since half of the time in Monrovia you get a frost after January 31 be ready to protect your erysimum if you have one of those late frosts.

USDA Zone Info for Monrovia

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 Monrovia

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