French Marigold in Zone 10B — Florida

French Marigolds are a fantastic addition to any Florida garden. Their cheerful blooms add a pop of color, plus they're edible and attract beneficial insects to your veggie patch. You’ll find they’re surprisingly easy to grow here, adding beauty and function to your landscape.

Of course, Florida gardening has its challenges: humidity, nematodes, and the occasional hurricane. But with French Marigolds, smart timing, and a little know-how, you can enjoy these beauties almost year-round in our 360-day growing season.

Starting French Marigold seeds indoors is definitely an option here in Florida, but honestly, it's usually not necessary. Our weather is mild enough that direct sowing works great for most of the year. However, if you want a head start, sow seeds indoors from early to late December, about six weeks before you plan to transplant.

Use seed trays with a good seed-starting mix. Keep them warm and provide plenty of light – a grow light works well. Don't forget to water from the bottom to avoid damping off. The reversed spring means you'll be ready to get these in the ground before the "normal" spring rush.

If you started your French Marigolds indoors, transplant them outdoors from mid January through early March. Before you plant them in the ground, remember to harden them off. Give them about a week of gradual exposure to the outdoors, increasing the amount of time they spend outside each day.

Plant them 8-10 inches apart in a sunny spot. Keep an eye on the weather forecast – a late cold snap is rare, but possible. You want to avoid any unexpected frost.

Direct sowing French Marigolds is super easy in our climate. With our long growing season, you can sow seeds directly into the garden from early January through late October. The soil needs to be warm enough for germination, so aim for soil temperatures above 65°F.

Prepare your soil by loosening it and adding some compost. Sow seeds about ¼ inch deep and 8-10 inches apart. Keep the soil consistently moist until the seedlings emerge. Direct sowing saves time and effort, and the plants often catch up quickly to those started indoors.

French Marigolds are pretty drought-tolerant once they're established, which is great for Florida's sometimes unpredictable rainfall. During the cooler months (late fall through early spring), you probably only need to water them once a week, unless we're having an unusually dry spell. Stick your finger about two inches deep into the soil – if it feels dry, it's time to water.

In the hotter, more humid summer months, you might need to water them a bit more frequently, especially if they're in containers. Aim for about an inch of water per week, either from rainfall or irrigation. The key is to avoid overhead watering because our high humidity can lead to fungal diseases. Water at the base of the plants instead.

Signs of underwatering include wilting leaves and dry soil. Overwatering, on the other hand, can cause yellowing leaves and root rot. Applying a layer of mulch around your plants helps to retain moisture in the soil and suppress weeds.

Deadheading is the name of the game when it comes to pruning French Marigolds. Regularly remove spent flowers to encourage continuous blooming throughout the season. Simply pinch or cut off the flower heads just below the bloom.

You can deadhead anytime you see a faded flower. There's no need to prune anything else. As we approach late December and our first frost, you can let the last flowers of the season mature and dry on the plant. Save the seeds for planting next year.

You can expect your first harvest of French Marigold flowers about 50 days after planting. Here in Florida, that means you could be harvesting from late February all the way through late December, depending on when you planted. Harvest the flowers when they are fully open and at their peak color.

Simply snip the stems with scissors or pruning shears. The more you harvest, the more flowers the plant will produce. To encourage continued production, keep deadheading spent flowers.

As late December approaches, and you see that first frost coming, you can let some of the last flowers dry on the plant. The seeds will mature in the dried flower heads, and you can collect them for planting next year.

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

Spider Mites *What it looks like:* Fine webbing on the leaves and tiny, moving dots (the mites themselves). Leaves may look stippled or discolored. *What causes it:* Dry heat, which can happen even in our humid climate during brief dry spells. *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 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 through spacing and pruning. Remove affected leaves. Neem oil or potassium bicarbonate sprays help. Milk spray (1 part milk to 9 parts water) is surprisingly effective.

Slugs *What it looks like:* Holes in the leaves of young plants, especially overnight. Slimy trails on the soil or leaves. *What causes it:* Moist conditions and plenty of hiding places for slugs. *How to fix/prevent it:* Handpick slugs off the plants, especially at night. Set out slug traps or use diatomaceous earth around the plants.

Florida Specific Challenges: Our hot, humid summers and wet-summer rainfall can create ideal conditions for fungal diseases like powdery mildew. Good air circulation and avoiding overhead watering are key to preventing these problems. Nematodes can also be an issue in our sandy soil, so consider using nematode-resistant varieties or amending your soil with organic matter.

French Marigolds are excellent companion plants for many vegetables in your Florida garden. They’re especially good friends with tomatoes and peppers because they help to repel nematodes and other pests. Basil also benefits from being planted near marigolds, as the marigolds can deter certain insects that bother basil.

Cucumbers also appreciate marigolds as neighbors, as they help to keep away cucumber beetles. Green beans generally benefit from marigolds, but some gardeners find they can attract spider mites to bean plants, so keep an eye on them and separate if needed.