The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You will be able to figure out when it's possible to plant alyssum by looking at the USDA zone info for Placentia.

Planting Calendar for Alyssum

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

Alyssum do well in cold which tells us that you can start planting them much earlier than other frost tender plants.

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

Last Frost Date

On average all chance of frost has passed is on January 31 in Placentia. You should expect an average low temperature of 30°F in the coldest months of winter.

Always keep in mind that USDA zone info for Placentia is an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Placentia there is a last frost after January 31 so make sure that you are prepared to cover your alyssum if you have one of those late frosts.

USDA Zone Info for Placentia

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 Placentia

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