When can I plant Lobelia in Zone 9b

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

A way of determining when you can plant lobelia is to use the USDA zone info for Zone 9b.


Planting Calendar for Lobelia

Frost tolerance for lobelia: Very tolerant of frost.
When you should plant them: Up to 7 weeks before last frost.

You can plant lobelia quite a bit earlier in the year because they are one of those plants that can tolerate quite a bit of cold weather.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant lobelia
Possibly ok, but a risky time to plant lobelia
Probably not a good time to plant lobelia

The earliest that you can plant lobelia in Zone 9b 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 lobelia and expect a good harvest is probably October. If you wait any later than that and your lobelia may not have a chance to grow to maturity. If you are starting your lobelia indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

In Zone 9b the average date of last frost happens on February 15. In the coldest months of winter we should expect an average low temperature of 25°F.

Remember that our actual date of last frost is just an average because it is based on the USDA zone info for Zone 9b and it changes from year to year. Half of the time in Zone 9b it frosts late in the year after February 15 so be sure to be ready to cover your lobelia if we have a surprise late frost.

USDA Zone Info for Zone 9b

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 Low25°F
Highest Expected Low30°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 Zone 9b

You may be interested in our other planting guides for Zone 9b.