French Marigold in Zone 8B — Texas

French Marigolds are worth their weight in gold here in Texas. Their bright, cheerful blooms add color to your garden, plus they're edible and attract beneficial insects that keep pests away from your tomatoes and peppers. And in our long growing season, you can enjoy them almost year-round!

Sure, Texas weather can be unpredictable. We might get a late freeze or a sudden hailstorm, but with a little planning, you can easily work around it. Our 273-day growing season gives you plenty of time to get a good crop of French Marigolds.

Starting French Marigolds indoors gives you a head start, especially if you want early blooms. Begin in late January through mid February, about six weeks before you plan to transplant. This is useful because the spring can arrive early here.

Use seed trays or small pots filled with a good seed-starting mix. Keep them warm and provide plenty of light – a grow light works wonders. Water from the bottom by placing the tray in a shallow dish of water; this encourages strong root growth.

Transplant your French Marigold seedlings outdoors from mid March through late April, after the last threat 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 Texas sun and wind.

Space them 8-10 inches apart in a sunny spot with well-draining soil. Keep an eye on the weather forecast – we sometimes get unexpected temperature swings in spring, so be ready to cover them if a late freeze threatens.

Direct sowing French Marigolds is easy and works well in our climate. Sow seeds from late February through late September, when the soil has warmed up. This gives you a huge window to get them going.

Prepare the soil by loosening it and removing any weeds. Sow seeds 8-10 inches apart and cover them with a thin layer of soil. Keep the soil consistently moist until the seedlings emerge. Direct sowing is convenient, but seedlings are more vulnerable to pests and weather than those started indoors.

Watering is key for French Marigolds, but they are surprisingly drought-tolerant once established, which is a blessing in the Texas heat. During the hot summer months, check the soil regularly. Stick your finger about two inches deep – if it feels dry, it's time to water.

Aim for about an inch of water per week, either from rainfall or irrigation. Water at the base of the plants to avoid wetting the foliage, especially with our variable humidity, which can encourage fungal diseases. Avoid overhead watering.

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. Adding a layer of mulch around your plants helps retain moisture and regulate soil temperature, which is especially helpful in the Texas heat.

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

Continue deadheading throughout the growing season. As the first frost approaches around late November, you can let the last flowers go to seed if you want to collect them for next year. Otherwise, remove the entire plant after it's finished blooming.

You can expect your first harvest of French Marigolds about 50 days after planting, so from mid April through late November. Harvest the flowers when they are fully open. You can use them fresh in salads or as a garnish.

To harvest, simply snip the flower stem just below the flower head. Regular harvesting encourages the plant to produce more blooms. As the end of the season approaches in late November, you can allow some of the flowers to dry on the plant to collect seeds for next year's garden.

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

Spider Mites

• What it looks like: Fine webbing on the leaves and tiny, spider-like creatures on the undersides. Leaves may look stippled or yellowed.
• What causes it: Hot, dry conditions are ideal for spider mites. Texas heat provides the perfect environment for them to thrive.
• How to fix/prevent it: Increase humidity by misting the plants regularly. 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 fruit. Leaves 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 leaves, especially on young plants. Slimy trails on the soil or foliage.
• What causes it: Slugs thrive in moist conditions. While Texas isn't always humid, we do get periods of heavy rain and flash floods.
• How to fix/prevent it: Handpick slugs at night. Use beer traps or diatomaceous earth around the plants.

Texas Specific Challenges: The hot-to-extreme heat, variable humidity, and unpredictable rainfall in Texas can stress French Marigolds, making them more susceptible to pests and diseases. Consistent watering and good air circulation are key to keeping them healthy. And watch out for those fire ants when you're working in the garden!

French Marigolds are great companions for many plants in your Texas garden. Plant them near tomatoes and peppers to deter nematodes and other pests. They also attract beneficial insects like ladybugs and hoverflies, which prey on aphids.

Basil also benefits from being planted near marigolds. The marigolds help repel pests that attack basil. Cucumbers appreciate marigolds as well, as they help deter cucumber beetles. Avoid planting marigolds near green beans, as they can sometimes inhibit bean growth.