One of the best tools that you have as gardeners to help us estimate 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 should be able to determine when it's the best time to plant ageratum by checking out the USDA zone info for Edmonds.

Planting Calendar for Ageratum

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

Ageratum require warm weather which means that you really should wait until it warms up after the last frost before you can plant them.

The earliest that you can plant ageratum in Edmonds 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. You can get started a few weeks earlier by starting your ageratum indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on March 15 in Edmonds. In the coldest months of winter you should expect an average low temperature of 15°F.

Since the USDA zone info for Edmonds 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 Edmonds it frosts late in the year after March 15 be ready to protect your ageratum if you have a surprise late frost.

USDA Zone Info for Edmonds

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 Edmonds

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