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

You should be able to estimate when it's a good idea to plant ajuga by reviewing the USDA zone info for Marlborough.

Planting Calendar for Ajuga

Frost tolerance for ajuga:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Ajuga are very cold tolerant which means that you can start planting them much earlier than other frost tender plants.

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

The last month that you can plant ajuga and expect a good harvest is probably September. If you wait any later than that and your ajuga may not have a chance to grow to maturity. If you are starting your ajuga indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Marlborough. It might get as low as -10°F during the coldest months of winter.

Since the USDA zone info for Marlborough is an average the actual date of last frost changes from year to year. Since half of the time in Marlborough it frosts late in the year after April 15 be ready to protect your ajuga in the event of a late frost.

USDA Zone Info for Marlborough

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°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 -5°F.

Plants to Grow in Marlborough

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