Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The earliest that you can plant polygonums in Cleveland should be figured out by checking out the USDA zone info.

Planting Calendar for Polygonums

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

You really shouldn't plant polygonums until after all chance of frost has passed because they do not do well in cold weather.

The earliest that you can plant polygonums in Cleveland 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 polygonums and expect a good harvest is probably August. If you wait any later than that and your polygonums may not have a chance to fully mature. You can get started a few weeks earlier by starting your polygonums indoors.

Last Frost Date

On average all chance of frost has passed is on March 15 in Cleveland. In the coldest months of winter you can expect an average low temperature of 10°F.

Since the USDA zone info for Cleveland may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Since half of the time in Cleveland you get surprised by a frost after March 15 be ready to cover your polygonums in the event of one of those late frosts.

USDA Zone Info for Cleveland

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°F

This means that on a really cold year, the coldest it will get is 10°F. On most years you should be prepared to experience lows near 15°F.

Plants to Grow in Cleveland

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