Tonight, Greg and Sheila do a rapid-fire Q & A session. We asked our followers and members of the Row By Row Facebook group to send in gardening questions that they may have for Greg to answer.

Questions & Answers Part 1:

Thoughts on using Round-Up Weed Kill around the edge of the garden? I'm in Zone 8 a/b and hybrid Bermuda grass runners are hard to keep out. "There is a lot of controversy out there regarding using "round-up" but I use it around the edge of my garden. It is ideal to use for the grass runners but ultimately it is a personal preference. I do not use it in my vegetable garden but I have been known to edge my garden with it", Greg states.

Will there ever be a clear dome made for the Heavy-Duty Bottom Trays? I don't have a greenhouse and it would be helpful for us in germinating our seeds in the house. "Probably not, the heavy-duty bottom tray is a catch basin for overflow of water for the 162 cell and 338 cell seed starting trays. There are no domes currently out there that are USA-made that we can find to carry. We do have smaller trays that have domes but for the larger trays, we do not have them", Greg answers.

All of my fall crops are loaded with whiteflies. They fly out like crazy. I sprayed with Sevin but it doesn't even phase them and I spray them when they are flying out as well, doesn't seem to affect them. "Whiteflies are tough to get rid of. We have done a couple of videos on this exact issue. You want to use Horticultural Oil (you can even use dish detergent), spray early in the morning or late in the evening, spray underneath the leaf." Greg says.

What vegetable or flower should never be grown in a pot because their roots grow so deep? "I'm not saying it can't be done but I would not grow corn, okra, or roselle in pots because of their deep root system.", Greg states.

Questions & Answers Part 2:

How do you know when to harvest the Roselle bush? "You want to pick it 7-10 days after it blooms, harvest it when it's tender, not when it's dry. The more you harvest, the more blooms you will have and will be able to continue to harvest for a few weeks.", Sheila answers.

Can I plant swiss chard right now in Zone 8? "Heck yeah, you have plenty of time to plant swiss chard. It does plenty of cold weather, I would say you can plant all the way up to November.", Greg says.

Can potatoes be planted again in summer or fall? I live in North Georgia, Zone 7B. "Potatoes can be grown either time, it is a lot more difficult to get seed potatoes in the fall but it can be done. Potatoes do not like the summer heat, we will plant them in the early spring and leave the summertime for okra", Greg answers.

What are tomato varieties that you have that would do good for fall and when should they be started? "Seems like you may be a little late, we normally plant our fall tomatoes in July in Zone 8. The two varieties that I am growing that I believe would be good for almost anywhere in the fall is Florida 91 and Homestead varieties."

Questions & Answers Part 3:

When to plant collards, sown in the ground in Zone 8a for the fall? Greg says, "You can plant them now and continue to plant them up until early November."

When do I start onions and garlic in Zone 7b, slightly north of Atlanta? "With garlic, you want to plant it 2-4 weeks before your first frost date. If you are growing a short day onion variety it will be the same thing, 2-4 weeks before the first frost. Anytime between October 15th and the first of November would be the ideal time to plant both, garlic and onions in Zone 7."

I'm in South Florida, I've heard that peppers love the sun.