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 USDA zone info for San Diego should be reffered to in order to determine when it's a good idea to plant canna.

Planting Calendar for Canna

Frost tolerance for canna:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since canna require warm weather it is necessary to wait until after the last frost has passed before you can plant them.

The earliest that you can plant canna in San Diego 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 canna and expect a good harvest is probably September. Any later than that and your canna may not have a chance to grow to maturity. Starting your canna indoors is a great way to get them started a few weeks earlier.

Last Frost Date

In San Diego the average date of last frost happens on February 15. In the coldest months of winter you can expect an average low temperature of 20°F.

Keep in mind that USDA zone info for San Diego may not be accurate from year to year and the actual date of last frost is different every year. Since half of the time in San Diego you get a frost after February 15 be ready to protect your canna if you have one of those late frosts.

USDA Zone Info for San Diego

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in San Diego

You may be interested in your other planting guides for San Diego.