French Marigold in Zone 8B — Florida

French Marigolds are fantastic for our Florida gardens. They're edible, adding a citrusy flavor to salads, and their bright colors attract pollinators while acting as a natural pest repellent for other plants in your garden. Plus, saving seeds from your own flowers gives a real sense of accomplishment.

Our Florida gardening calendar is different, and summer can be a challenge. But with French Marigolds, you can enjoy blooms almost year-round, thanks to our long 303-day growing season. Timing is key to avoiding the worst of the summer heat.

Starting French Marigolds indoors is an option, but honestly, with our long growing season, it's usually not necessary unless you're aiming for a very early bloom. If you want to get a head start, sow seeds indoors from mid January through early February, about six weeks before you'd transplant them outside.

Use seed trays with a good seed-starting mix, and keep them in a warm spot with plenty of light – a sunny windowsill or under grow lights works well. Bottom watering will help prevent damping off, which can be a problem in our humid Florida climate. Remember our spring character is reversed, so we are trying to rush the season.

Transplant your French Marigold seedlings outdoors from early March through mid April, once the danger of frost has passed. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Florida sun and wind.

Space them 8-10 inches apart in well-draining soil. Keep an eye on the weather; we can still get some unexpected cold snaps during this time of year, so be prepared to cover them if needed.

Direct sowing French Marigold seeds is easy and often the preferred method here in Florida. You can sow seeds directly into your garden beds from mid February through mid October. This gives you a long window to get multiple successions of blooms.

Make sure the soil is warm and well-draining. Gently press the seeds into the soil, about ¼ inch deep, and keep them consistently moist until they germinate. Thin seedlings to 8-10 inches apart once they have a few sets of leaves.

French Marigolds are drought-tolerant once established, which is great for our occasional dry spells, but young plants need consistent moisture. In the spring and fall, when temperatures are milder, water deeply about once a week, providing about 1 inch of water. Use the finger test: if the top 2 inches of soil are dry, it's time to water.

During our hot, humid summers, you might only need to supplement rainfall. Avoid overhead watering, especially in the evenings, as this can promote fungal diseases in our humid climate. Water at the base of the plants to keep the foliage dry.

Signs of underwatering include wilting and dry, crispy leaves. Overwatering can lead to yellowing leaves and root rot. A good layer of mulch, like pine straw or wood chips, will help retain moisture in the soil and suppress weeds.

Deadheading is key to keeping your French Marigolds blooming throughout the season. Regularly remove spent flowers by snipping them off just below the flower head. This encourages the plant to produce more blooms rather than putting energy into seed production.

You can deadhead throughout the growing season, from spring through fall. As our first frost approaches around mid- December, you can let the last flowers of the season go to seed if you want to collect them for next year.

You can expect your first harvest of French Marigold blooms about 50 days after planting. In Florida, that means you could be harvesting from early April through mid December, depending on when you planted. Harvest the flowers when they are fully open and the petals are vibrant.

To harvest, simply snip the stem just below the flower head. Harvesting regularly encourages continued production. If you want to save seeds, allow some of the flower heads to dry completely on the plant. Once dry, you can collect the seeds for next year's planting. As the first frost approaches in mid- December, harvest any remaining blooms before they are damaged.

Here are a few common problems you might encounter with French Marigolds in Florida:

Spider Mites

• What it looks like: Fine webbing on the leaves and stems, tiny yellow or brown spots on the leaves, and stunted growth.
• What causes it: Spider mites thrive in hot, dry conditions. While Florida is humid, we do get dry spells, especially in the spring, which can make plants vulnerable.
• How to fix/prevent it: Increase humidity around the plants by misting them regularly. You can also spray them with a strong stream of water to knock the mites off. Insecticidal soap or neem oil can be effective.

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes fruit. Leaves curl, yellow, and die. Reduces plant vigor.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi). Our high humidity makes this a common issue.
• 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. Plant resistant varieties.

Slugs

• What it looks like: Holes in leaves, especially on young plants. Slimy trails on the soil and leaves.
• What causes it: Slugs love moist, shady conditions. Our humid climate and frequent rainfall create the perfect environment for them.
• How to fix/prevent it: Handpick slugs off the plants, especially at night. You can also use slug bait or create traps using beer or diatomaceous earth.

Florida Specific Challenges: Our hot heat, very-high humidity, and wet-summer rainfall can create a breeding ground for fungal diseases and pests. Proper spacing, good air circulation, and vigilant monitoring are key to keeping your French Marigolds healthy.

French Marigolds are great companions for many plants in your Florida garden. They deter nematodes and other pests. Plant them near tomatoes and peppers to help protect them from soil-borne pests. They also work well with basil, as the marigolds deter pests and the basil attracts pollinators.

Cucumbers also benefit from marigold companions, as they help repel cucumber beetles. Green beans are also good companions. However, avoid planting French Marigolds directly *amongst* green beans, as they can sometimes inhibit bean growth – keep them nearby but not directly intermixed.