French Marigold in Zone 6A — Southeast

French Marigolds are worth a spot in your Southeast garden for their bright color and pest-repelling qualities, especially near tomatoes and peppers. They're edible too, adding a citrusy zing to salads, and their cheerful blooms last all summer long. Plus, saving seeds from these beauties is super easy, so you can have even more next year.

We definitely have our share of challenges here in the Southeast, from the humidity that breeds fungal diseases to those pesky Japanese beetles. But with our long, 198-day growing season, you've got plenty of time to get French Marigolds established and thriving before any major issues hit. Good planning makes all the difference.

Starting French Marigolds indoors from early to late March gives you a head start, but it's not essential. You'll want to start them about 6 weeks before you plan to transplant them outdoors. If you're itching to garden before our moderate spring really kicks in, then starting them indoors is a great way to go.

Use seed trays with a good seed-starting mix. Keep the soil consistently moist, watering from the bottom to avoid damping-off, and provide plenty of light. A simple shop light works just fine.

Transplant your French Marigold seedlings outdoors from late April through early June, once the danger of frost has passed. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind, which they haven't experienced indoors.

Space them 8-10 inches apart in a sunny spot. Keep an eye on the weather forecast; we can still get some cool snaps during this time. Be prepared to cover your transplants if a late frost threatens.

Direct sowing French Marigold seeds is easy and works well in our Southeast climate. You can sow seeds directly into the garden from early April through late August. Just make sure the soil has warmed up a bit.

Prepare the soil by loosening it and removing any weeds. Sow the seeds about 1/4 inch deep and 8-10 inches apart. Keep the soil consistently moist until the seedlings emerge. Direct sowing is less work initially, but you'll need to thin seedlings to ensure proper spacing.

French Marigolds are relatively drought-tolerant once established, which is great for our long summers. However, consistent watering is important, especially when they're young. The key is to avoid overwatering in our humid climate.

During the spring and early summer, when we get our regular afternoon thunderstorms, you might not need to water much at all. Stick your finger about 2 inches deep into the soil; if it feels dry, it's time to water. Aim for about 1 inch of water per week, either from rain or irrigation. Water at the base of the plants to avoid getting the foliage wet, which can encourage fungal diseases.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to root rot, so watch out for yellowing leaves and a mushy stem base. A good layer of mulch, like pine straw or shredded leaves, helps retain moisture and suppress weeds, but don't overdo it in our humid climate or it can trap too much moisture.

Deadheading French Marigolds is key to keeping them blooming all season long. Simply pinch or cut off the spent flowers just below the flower head. This encourages the plant to produce more blooms instead of putting energy into seed production.

Do this regularly throughout the growing season, whenever you see faded or dried-up flowers. As our first frost approaches in late October, you can stop deadheading and let the plants go to seed if you want to collect seeds for next year.

You can expect your first French Marigold blooms about 50 days after planting, or from late May through late October if you're direct sowing continuously. Harvest the flowers when they are fully open and the color is vibrant. The petals are edible and add a citrusy flavor to salads.

To harvest, simply cut the stem just below the flower head. This encourages the plant to produce more blooms. For continuous production, harvest regularly throughout the season. Towards the end of the season, as frost approaches, you can still harvest any remaining blooms, but consider letting some flowers dry on the plant if you want to collect seeds for next year. Let the flower heads dry completely on the plant, then collect the seeds and store them in a cool, dry place.

French Marigolds are generally easy to grow, but here are a few common problems you might encounter in the Southeast:

Spider Mites

• What it looks like: Fine webbing on the leaves and tiny specks moving around. Leaves may look stippled or yellowed.
• What causes it: Dry, hot conditions favor spider mites. They can become a problem during dry spells in our summers.
• How to fix/prevent it: Increase humidity around the plants by misting them with water. Insecticidal soap or neem oil can also help control infestations.

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes flower buds. Leaves may curl, yellow, and die.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi).
• How to fix/prevent it: Improve air circulation by spacing plants properly and pruning if needed. Remove affected leaves promptly. Neem oil or potassium bicarbonate sprays can help. A milk spray (1 part milk to 9 parts water) is surprisingly effective.

Slugs

• What it looks like: Holes in leaves, especially on young plants. Slimy trails on and around the plants.
• What causes it: Slugs thrive in moist conditions and can be a problem, especially after heavy rains in the spring.
• How to fix/prevent it: Handpick slugs at night. Use slug bait or traps. Copper tape around the base of plants can also deter slugs.

Southeast Specific Challenges: The hot, humid summers in the Southeast can create ideal conditions for fungal diseases like powdery mildew, so good air circulation is essential. Our wet-summer rainfall can also make young plants vulnerable to slugs. Keep an eye out for these issues and take action early to keep your French Marigolds healthy and blooming.

French Marigolds make excellent companions for several vegetables in the Southeast garden. Plant them near tomatoes and peppers to deter nematodes and other pests. They also work well with basil, as the marigolds help repel insects that might attack the basil.

Cucumbers also benefit from having French Marigolds nearby, as they deter cucumber beetles. However, avoid planting French Marigolds near green beans, as they can attract bean beetles.