Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of making a decision about when it's the best time to plant hypericum is to use the USDA zone info for Princeton.

Planting Calendar for Hypericum

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

Hypericum are barely cold tolerant which tells us that you can plant them slightly earlier than more sensitive plants.

The earliest that you can plant hypericum in Princeton 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 hypericum and expect a good harvest is probably August. If you wait any later than that and your hypericum may not have a chance to fully mature. Starting your hypericum indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is March 15 in Princeton. You can expect an average low temperature of 10°F in the coldest months of winter.

Since the USDA zone info for Princeton is an average the actual date of last frost can change quite a bit from year to year. Half of the time in Princeton you get a frost after March 15 so make sure that you are prepared to protect your hypericum in the event of a late frost.

USDA Zone Info for Princeton

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°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 15°F.

Plants to Grow in Princeton

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