Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The earliest that you can plant gomphrena in Derby can be determined by looking at the USDA zone info.

Planting Calendar for Gomphrena

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

Gomphrena do ok in moderate cold which tells us that you can plant them slightly earlier than other frost tender plants.

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

Last Frost Date

The average date of last frost is April 15 in Derby. You should expect an average low temperature of -5°F in the coldest months of winter.

Since the USDA zone info for Derby may not be accurate from year to year the actual date of last frost is different every year. Half of the time in Derby you get surprised by a frost after April 15 so make sure that you are prepared to protect your gomphrena in the event of a late frost.

USDA Zone Info for Derby

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 Derby

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