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.

The first chance to plant mecardonia in Riverside should be figured out by checking out the USDA zone info.

Planting Calendar for Mecardonia

Frost tolerance for mecardonia:	Not tolerant of frost.
When to plant:	After the last frost.

It's not a good idea to plant mecardonia until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant mecardonia in Riverside is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant mecardonia and expect a good harvest is probably September. You probably don't want to wait any later than that or else your mecardonia may not have a chance to really do well. If you are starting your mecardonia indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

The average date of last frost is February 15 in Riverside. You should expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Riverside is an average the actual date of last frost is different every year. Half of the time in Riverside you get surprised by a frost after February 15 so always be ready to cover your mecardonia in the event of one of those late frosts.

USDA Zone Info for Riverside

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 Riverside

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