One of the first steps you take when you are estimating 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.

By reviewing the USDA zone info for Santa Ana you should be able to figure out when it's possible to plant oxalis.

Planting Calendar for Oxalis

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

Since oxalis require warm weather you need to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant oxalis in Santa Ana is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant oxalis and expect a good harvest is probably September. If you wait any later than that and your oxalis may not have a chance to really do well. You can get started a little bit earlier by starting your oxalis indoors.

Last Frost Date

In Santa Ana the average date of last frost happens on January 31. It might get as low as 30°F during the coldest months of winter.

Remember that USDA zone info for Santa Ana is not always accurate and the actual date of last frost changes from year to year. Since half of the time in Santa Ana you get surprised by a frost after January 31 be ready to cover your oxalis in the event of one of those late frosts.

USDA Zone Info for Santa Ana

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 Santa Ana

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