French Marigold in Zone 9B — Texas

French Marigolds are a fantastic addition to any Texas garden. They're easy to grow, offer a pop of color in our sometimes-monotonous landscape, and even help protect your veggie patch. Plus, with our long growing season, you can enjoy their cheerful blooms for most of the year.

Sure, we've got the Texas heat, unpredictable weather, and the occasional drought to contend with. But with a little planning and the right timing, you can absolutely thrive with French Marigolds. Our 308-day growing season gives you plenty of chances to get it right.

Starting French Marigolds indoors gives you a jump start, especially if you're aiming for that early spring bloom. Starting seeds indoors from early to late January, about six weeks before you want to transplant them, is a good idea.

Use seed trays with a good seed-starting mix, and keep them warm – a heat mat helps. Make sure they get plenty of light; a grow light is best if you don't have a sunny windowsill. Bottom watering is your friend here; it keeps the seedlings moist without inviting fungal diseases.

Given our early spring character, starting indoors can be a good hedge against any late freezes. However, French Marigolds are pretty easy to direct sow, so don't feel like you *have* to start them inside.

Transplanting your French Marigold seedlings outdoors from mid February through early April is a good time. Before you do, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Texas sun and wind.

Plant them 8-10 inches apart in well-draining soil. Keep an eye on the weather forecast; we can still get some unpredictable freezes during this time. If a freeze is coming, cover your seedlings to protect them.

Direct sowing French Marigolds is a breeze in Texas, thanks to our long growing season. You can sow seeds directly into the garden from early February through early October. Just make sure the soil temperature is at least 70°F for best germination.

Prepare the soil by loosening it and removing any weeds or rocks. Sow the seeds about ¼ inch deep and 8-10 inches apart. Keep the soil consistently moist until the seedlings emerge, usually in about a week. Direct sowing is super convenient, but keep in mind that you'll need to protect the young seedlings from slugs and other pests.

French Marigolds are pretty drought-tolerant once they're established, which is a huge plus in Texas. But that doesn't mean you can neglect them entirely, especially during our brutal summer heat.

During the spring, when the weather is milder and rainfall is more frequent (though still unpredictable!), water your French Marigolds about once a week, unless we've had a good soaking rain. As the Texas heat ramps up in the summer, you might need to water them two or three times a week, depending on the rainfall and humidity.

Stick your finger about two inches into the soil near the base of the plant. If it feels dry, it's time to water. Aim for about an inch of water per week. Water at the base of the plant to avoid getting the foliage wet, which can encourage fungal diseases, especially with our variable humidity.

Signs of underwatering include wilting leaves and stunted growth. Overwatering, on the other hand, can lead to root rot and yellowing leaves. A good layer of mulch around your plants helps retain moisture in the soil and keeps the roots cool during the summer.

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

You can deadhead throughout the growing season, whenever you see flowers that are starting to fade. As the first frost approaches around early December in Texas, you can let the last flowers go to seed if you want to collect them for next year. Otherwise, you can remove the entire plant after the first frost.

You can expect your first French Marigold harvest about 50 days after planting. In our zone, that means you could be harvesting as early as late March and continuing all the way through early December, depending on when you planted.

Harvest the flowers when they are fully open and the petals are vibrant. Simply cut the stem just above a set of leaves. The more you harvest, the more flowers the plant will produce.

If you want to save seeds for next year, let some of the flower heads dry completely on the plant. Once they are brown and brittle, you can collect the seeds. As the first frost approaches in early December, harvest any remaining flowers before they get damaged by the cold.

Even though French Marigolds are relatively easy to grow, they can still run into a few problems in Texas. Here are the most common ones:

Spider Mites

• What it looks like: Fine webbing on the leaves and stems, tiny yellow or brown spots on the leaves, and overall poor plant vigor.
• What causes it: Hot, dry conditions are a breeding ground for spider mites. The Texas heat, combined with periods of drought, can create the perfect environment for them to thrive.
• How to fix/prevent it: Increase humidity around the plants by misting them with water. You can also use insecticidal soap or neem oil to control the infestation.

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 variable humidity can create conditions that are just right for powdery mildew to develop.
• 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 the leaves, especially on young plants. Slimy trails on the leaves and soil.
• What causes it: Slugs are attracted to moist, shady conditions. While Texas isn't always known for being moist, we do have periods of high humidity and heavy rainfall that can create ideal conditions for slugs.
• How to fix/prevent it: Handpick slugs off the plants, especially at night. You can also use slug bait or create barriers around the plants using copper tape or diatomaceous earth.

Texas Specific Challenges: The combination of hot-to-extreme heat, variable humidity, and unpredictable rainfall can make it challenging to keep your French Marigolds healthy in Texas. The key is to monitor your plants regularly, water them appropriately, and take action quickly if you notice any problems.

French Marigolds are great companions for many vegetables in the Texas garden.

• Tomatoes and Peppers: Marigolds repel nematodes and other soil pests that can damage tomato and pepper roots.
• Basil: Marigolds help deter aphids and other pests that can attack basil.
• Cucumbers: Marigolds attract beneficial insects that pollinate cucumber flowers.
• Avoid Planting Near Beans: While marigolds are generally beneficial, avoid planting them near beans. They can inhibit bean growth.