Chrysanthemum in Zone 8B — Southeast

Chrysanthemums are a fantastic addition to any Zone 8B Southeast garden, bringing vibrant color and classic beauty. Their long bloom time, especially in our extended growing season, means you can enjoy their cheerful flowers from late spring well into the fall. They also make excellent cut flowers, perfect for bringing a bit of the garden indoors.

Our hot and humid summers can present some challenges with fungal diseases and pests, but with proper timing and care, you can easily grow healthy and productive Chrysanthemums. Our 255-day growing season gives you plenty of time to get them established and thriving.

Starting Chrysanthemum seeds indoors can give you a head start, though it's not always necessary. If you're aiming for blooms as early as possible, or want to grow a specific variety that's hard to find locally, it’s a good option.

Start your seeds indoors from early to late January, about eight weeks before you plan to transplant them outdoors. Use seed trays with a good seed-starting mix, keep them warm (around 70°F), and provide plenty of light—a grow light works best. Consider bottom watering to keep the soil consistently moist without overwatering from above. Our moderate spring means you have a little breathing room, so don't feel rushed.

Whether you've started your own seeds or purchased starts, transplanting Chrysanthemums outdoors in the Southeast is best done from early March through early April. This gives them plenty of time to establish before our hot summer arrives.

Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. Plant them 12-18 inches apart in well-draining soil. Keep an eye on the weather – those lingering cool snaps we sometimes get in early spring can stress young plants, so be ready to cover them if needed.

In our hot, humid Southeast climate, watering Chrysanthemums correctly is key to preventing problems. While they need consistent moisture, they don't like soggy feet or wet foliage.

During the spring and fall, when temperatures are milder, aim to water deeply about once or twice a week, providing around 1 inch of water each time. In the heat of summer, especially during dry spells between our afternoon thunderstorms, you may need to water every other day or even daily. Use the "finger test" – stick your finger about 2 inches into the soil; if it feels dry, it's time to water. Always water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid air.

Signs of underwatering include wilting leaves and dry, crispy edges. Overwatering can lead to yellowing leaves and root rot. A good layer of mulch around your plants helps retain moisture and suppress weeds.

Pruning Chrysanthemums is essential for encouraging bushy growth and abundant blooms. The key is to pinch off the growing tips regularly until early summer.

Start pinching the growing tips every 2-3 weeks, removing the top inch or so of the stem, from when the plants are about 6 inches tall until around July 4th. This encourages the plant to branch out and produce more flowering stems. After July 4th, stop pinching to allow flower buds to form. As the season winds down and our first frost approaches around mid- November, you can cut back the plants to a few inches above the ground.

Harvesting Chrysanthemums is a rewarding part of growing them in the Southeast, and you can expect your first harvest from mid May through early July. The flowers last for weeks in the garden, but they also make excellent cut flowers.

Cut the stems when the flowers are fully open, choosing stems with strong, straight growth. Use clean, sharp pruners to avoid damaging the plant. Cutting flowers regularly encourages the plant to produce more blooms. As our first frost approaches in mid- November, harvest any remaining flowers to enjoy indoors.

Chrysanthemums in the Southeast can be susceptible to a few common problems:

Aphids *What it looks like:* Clusters of tiny soft-bodied insects (green, black, or white) on stems and leaf undersides. Sticky honeydew residue. Curled or distorted new growth. *What causes it:* Rapid-reproducing sap-sucking insects. Populations explode in warm weather. Ant colonies may farm them for honeydew. *How to fix/prevent it:* Strong water spray knocks them off. Encourage ladybugs and lacewings (natural predators). Insecticidal soap for heavy infestations. Neem oil works systemically. Avoid excess nitrogen fertilizer (it attracts them).

Spider Mites *What it looks like:* Fine stippling on leaves (tiny white dots). Fine webbing on leaf undersides and between stems. Leaves turn bronze or yellow. *What causes it:* Tiny arachnids that thrive in hot, dry conditions. Populations explode in drought stress. *How to fix/prevent it:* Strong water spray (daily for a week) is the best treatment. Increase humidity around plants. Neem oil or insecticidal soap. Release predatory mites (Phytoseiulus persimilis). Avoid broad-spectrum pesticides that kill predators.

Leaf Miners *What it looks like:* Tan, squiggly lines or blotches on leaves. The larval feeding tunnels are visible within the leaf tissue. *What causes it:* Larvae of small flies or moths that tunnel between the upper and lower leaf surfaces. *How to fix/prevent it:* Remove and destroy affected leaves. Use floating row covers to prevent adult insects from laying eggs on the plants. Neem oil can deter egg-laying and kill young larvae.

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 that spread via wind-borne spores. Favored by warm, humid conditions with moisture on leaves. *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.

Southeast Specific Challenges: The hot and humid summers in the Southeast create ideal conditions for fungal diseases like rust. Good air circulation, proper watering techniques, and preventative fungicide applications can help manage these issues. Japanese beetles can also be a nuisance, so hand-picking them off plants or using traps may be necessary. Deer can also be a problem, so consider using fencing or deer repellent to protect your plants.

Chrysanthemums benefit from companion planting in the Southeast garden. Planting them near tomatoes and peppers can be helpful because Chrysanthemums deter some pests that bother those veggies. Lettuce also makes a good companion, as the shade provided by the Chrysanthemums can help keep the lettuce from bolting in our summer heat. Avoid planting them near because they can compete for nutrients and water.