One of the best tools that you have as gardeners to help us determine 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.

You will be able to determine when it's the best time to plant ageratum by using the USDA zone info for Monessen.

Planting Calendar for Ageratum

Frost tolerance for ageratum:	Not tolerant of frost.
When to plant:	After the last frost has passed.

It's not a good idea to plant ageratum until after the last frost because they require warm weather.

The earliest that you can plant ageratum in Monessen 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 ageratum and expect a good harvest is probably August. If you wait any later than that and your ageratum may not have a chance to grow to maturity. If you are starting your ageratum indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average the last frost is on April 15 in Monessen. In the coldest months of winter you can expect an average low temperature of -5°F.

Since the USDA zone info for Monessen is not always accurate the actual date of last frost is different every year. Since half of the time in Monessen there is a last frost after April 15 be ready to cover your ageratum in the event of a surprise late frost.

USDA Zone Info for Monessen

Here is the info for USDA Zone 6b.

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

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

Plants to Grow in Monessen

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