The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Markham should be used to determine when it's a good idea to plant artemesia.

Planting Calendar for Artemesia

Frost tolerance for artemesia:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Since artemesia are barely cold tolerant you can plant them just a tiny bit earlier in the year than more sensitive plants.

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

The last month that you can plant artemesia and expect a good harvest is probably August. If you wait any later than that and your artemesia may not have a chance to really do well. Starting your artemesia indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

In Markham the average date of last frost happens on April 15. It might get as low as -15°F during the coldest months of winter.

Keep in mind that USDA zone info for Markham is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Markham last frost occurs after April 15 so make sure that you are ready to cover your artemesia in the event of a surprise late frost.

USDA Zone Info for Markham

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°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 -10°F.

Plants to Grow in Markham

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