One of the first steps you take when you are making a decision about 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.

A common way of getting a good idea when you can plant pennisetum is to refer to the USDA zone info for Walla Walla.

Planting Calendar for Pennisetum

Frost tolerance for pennisetum:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant pennisetum a bit earlier in the year because they do ok in moderate cold.

The earliest that you can plant pennisetum in Walla Walla 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 pennisetum and expect a good harvest is probably August. Any later than that and your pennisetum may not have a chance to really do well. You can get started a couple of weeks earlier by starting your pennisetum indoors.

Last Frost Date

The average date of last frost is April 15 in Walla Walla. You can expect an average low temperature of 0°F in the coldest months of winter.

Since the USDA zone info for Walla Walla may not be accurate from year to year the actual date of last frost changes from year to year. Half of the time in Walla Walla you get a frost after April 15 so always be ready to protect your pennisetum in the event of one of those late frosts.

USDA Zone Info for Walla Walla

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Walla Walla

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