One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In South Houston you can determine when it's a good idea to plant alstromeria by using the USDA zone info.

Planting Calendar for Alstromeria

Frost tolerance for alstromeria:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since alstromeria are moderately cold tolerant you can plant them a little earlier in the year than other frost tender plants.

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

Last Frost Date

In South Houston the average date of last frost happens on February 15. In the coldest months of winter you should expect an average low temperature of 20°F.

Remember that USDA zone info for South Houston may not be accurate from year to year and the actual date of last frost changes from year to year. Since half of the time in South Houston there is a last frost after February 15 be ready to cover your alstromeria if you have a late frost.

USDA Zone Info for South Houston

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 South Houston

You may be interested in your other planting guides for South Houston.