One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of determining when it's a good idea to plant ageratum is to look at the USDA zone info for Riverview.

Planting Calendar for Ageratum

Frost tolerance for ageratum:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

It's probably a bad idea to plant ageratum until after all chance of frost has passed because they require warm weather.

The earliest that you can plant ageratum in Riverview 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. Any later than that and your ageratum may not have a chance to grow to maturity. You can get started a little bit earlier by starting your ageratum indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Riverview. In the coldest months of winter you can expect an average low temperature of -5°F.

Since the USDA zone info for Riverview is just an average the actual date of last frost will vary from year to year. Half of the time in Riverview it frosts late in the year after April 15 so just be sure to be ready to protect your ageratum in the event of a late frost.

USDA Zone Info for Riverview

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 Riverview

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