Before planting it is a good idea to find your USDA Zone info to determine 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.

In New Castle you can determine when it's a good idea to plant argyranthemum by using the USDA zone info.

Planting Calendar for Argyranthemum

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

Since argyranthemum require warm weather it's important to wait until after the last frost has passed before you can plant them.

The earliest that you can plant argyranthemum in New Castle 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 argyranthemum and expect a good harvest is probably August. Any later than that and your argyranthemum may not have a chance to really do well. You can get started a few weeks earlier by starting your argyranthemum indoors.

Last Frost Date

The average date of last frost is April 15 in New Castle. You can expect an average low temperature of -15°F in the coldest months of winter.

Just be sure to remember that the actual date of last frost may not be accurate from year to year because it is based on the USDA zone info for New Castle and it can change quite a bit from year to year. Half of the time in New Castle you get surprised by a frost after April 15 so make sure that you are ready to cover your argyranthemum in the event of a late frost.

USDA Zone Info for New Castle

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 New Castle

You may be interested in your other planting guides for New Castle.