One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The first chance to plant lobelia in Herndon should be estimated by checking out the USDA zone info.

Planting Calendar for Lobelia

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

You can plant lobelia earlier in the year because they are very cold tolerant.

The earliest that you can plant lobelia in Herndon 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 lobelia and expect a good harvest is probably September. You probably don't want to wait any later than that or else your lobelia may not have a chance to really do well. You can get started a few weeks earlier by starting your lobelia indoors.

Last Frost Date

On average the last frost is on April 15 in Herndon. You can expect an average low temperature of 0°F in the coldest months of winter.

Keep in mind that USDA zone info for Herndon is just an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Herndon there is a last frost after April 15 be ready to cover your lobelia in the event of a late frost.

USDA Zone Info for Herndon

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Herndon

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