One of the first steps you take when you are figuring out your gardening schedule is find your 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.

By reviewing the USDA zone info for Gresham you will be able to estimate when to plant argyranthemum.

Planting Calendar for Argyranthemum

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

It's a bad idea to plant argyranthemum until after the last frost when the weather gets warmer because they do not do well in cold weather.

The earliest that you can plant argyranthemum in Gresham is April. However, you really should wait until May if you don't want to take any chances.

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

Last Frost Date

The average date of last frost is March 15 in Gresham. It might get as low as 15°F during the coldest months of winter.

Since the USDA zone info for Gresham is not always accurate the actual date of last frost changes from year to year. Since half of the time in Gresham it frosts late in the year after March 15 be ready to cover your argyranthemum in the event of one of those late frosts.

USDA Zone Info for Gresham

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°F

This means that on a really cold year, the coldest it will get is 15°F. On most years you should be prepared to experience lows near 20°F.

Plants to Grow in Gresham

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