Chrysanthemum in Zone 6B — Texas

Chrysanthemums are a fantastic addition to any Texas garden. Their vibrant blooms bring a burst of color, especially when other flowers are fading. Plus, they make beautiful cut flowers that last a long time indoors, and they are a great addition to any fall garden.

Our unpredictable Texas weather can be tough, but with Chrysanthemums, you've got a good head start. Our long 230-day growing season gives you a solid window to get them established and blooming beautifully.

Starting Chrysanthemum seeds indoors is an option, but honestly, with our long growing season, it's often easier to buy starts from a local nursery in the spring. However, if you're set on starting from seed, go for it!

Begin indoors in late January through mid February, about eight weeks before you plan to transplant. Use seed trays with a good seed-starting mix, keep them warm, and provide plenty of light. Bottom watering is a great way to keep the soil consistently moist without disturbing the tiny seedlings. Our early spring warmth means you'll want to keep an eye on them to avoid them drying out too quickly.

Transplanting your Chrysanthemums outdoors should happen in late March through late April. Before you plant, harden them off by gradually exposing them to the outdoors for about a week. This helps them adjust to the Texas sunshine and wind.

Space them about 12-18 inches apart to give them room to grow. Keep an eye on the unpredictable weather; a late freeze can still happen, so be ready to cover them if needed. Buying established plants in the spring is also a great option.

Watering is key to keeping your Chrysanthemums happy in the Texas heat. While they need moderate watering, they aren't drought-tolerant, so you'll need to stay on top of it, especially during our hot summers.

A good rule of thumb is to water deeply when the top two inches of soil feel dry – the "finger test." During the hottest parts of the summer, that might mean watering every other day, providing about an inch of water each time. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases with our variable humidity.

Watch for signs of underwatering, like wilting leaves, and overwatering, like yellowing leaves. Mulching around your plants with a couple of inches of organic matter helps retain moisture and keeps the soil cooler, which is a lifesaver in the Texas heat.

Pruning Chrysanthemums is all about encouraging bushier growth and more blooms. The key is to pinch off the growing tips of the stems every 2-3 weeks from when the plant is young until about July 4th.

This forces the plant to send out more side shoots, resulting in a fuller, more compact plant loaded with flowers. After July 4th, stop pinching so the flower buds can develop. As the first frost approaches around early November, you can cut back the foliage to tidy up the plants.

Your Chrysanthemums will typically start blooming in early June through late July, depending on the variety and when you planted them. The flowers last for weeks in the garden, so you'll have plenty of time to enjoy them.

Harvest them for bouquets when the flowers are fully open. Cut the stems at an angle just above a leaf node to encourage new growth. Keep deadheading (removing spent flowers) to keep the plant producing more blooms.

As the first frost approaches in early November, you can cut the remaining flowers to bring indoors, or leave them for some late-season color.

Here are some common problems you might encounter with Chrysanthemums in Texas:

Aphids

• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. You might also see a sticky honeydew residue and curled or distorted new growth.
• What causes it: These sap-sucking insects reproduce rapidly, especially in warm weather. Ants often "farm" them for the honeydew.
• How to fix/prevent it: A strong spray of water can knock them off. Encourage ladybugs and lacewings. Use insecticidal soap for heavy infestations or neem oil. Avoid over-fertilizing with nitrogen.

Spider Mites

• What it looks like: Fine stippling (tiny white dots) on leaves. Fine webbing on leaf undersides. Leaves turning bronze or yellow.
• What causes it: These tiny arachnids thrive in hot, dry conditions. Drought stress makes them worse.
• How to fix/prevent it: Strong water spray daily for a week is your best bet. Increase humidity around plants. Use neem oil or insecticidal soap. Release predatory mites.

Leaf Miners

• What it looks like: Tan, winding trails or blotches inside the leaves.
• What causes it: The larvae of certain flies and moths tunnel between the leaf surfaces, feeding as they go.
• How to fix/prevent it: Remove and destroy affected leaves. Use row covers to prevent the adult insects from laying eggs on the plants. Systemic insecticides can be used in severe cases, but they can also harm beneficial insects.

Rust

• What it looks like: Rusty orange, yellow, or brown pustules on leaves and stems, mostly on undersides. Leaves yellow and drop prematurely.
• What causes it: Various rust fungi spread via wind-borne spores. Warm, humid conditions with moisture on leaves favor rust.
• How to fix/prevent it: Remove affected leaves. Avoid overhead watering. Improve air circulation. Apply sulfur or copper fungicide. Don't work among wet plants. Rotate crops.

Texas Specific Challenges: The hot-to-extreme heat, variable humidity, and unpredictable rainfall in Texas can create a perfect storm for pests and diseases. Keep a close eye on your Chrysanthemums, especially during the summer, and be ready to act quickly if you spot any problems. Fire ants can also be a nuisance, so keep them under control to protect your plants.

Good companion plants for Chrysanthemums include tomatoes, peppers, and lettuce. Tomatoes and peppers can provide some shade during the hottest part of the day, which is helpful in the Texas heat. Lettuce benefits from the slight shade provided by the Chrysanthemums, preventing it from bolting too quickly in the spring.

Avoid planting Chrysanthemums near anything that requires heavy watering or is susceptible to similar diseases, as this can create an environment that encourages fungal problems in our humid conditions.