Geranium in Zone 6B — Texas

Geraniums bring a splash of color to our Texas gardens, and they're surprisingly resilient in our variable climate. Their vibrant blooms are great for beds, borders, and containers, adding a touch of charm to your outdoor spaces from spring through fall.

While we face challenges like the brutal Texas heat and unpredictable weather, geraniums, with proper care and timing, can thrive here. Our long growing season, stretching roughly 230 days, gives them plenty of time to flourish, offering beauty and enjoyment in your garden.

Starting geraniums from seed indoors is an option, but honestly, they can be pretty slow-growing. If you're up for the challenge and want specific varieties, go for it. Otherwise, buying established plants from a local nursery is often the easier route.

If you're starting from seed, aim for early to late January. This gives them about 12 weeks to get a head start before transplanting. Use seed trays with a good seed-starting mix, provide warmth (a heat mat helps), and ensure plenty of light, especially since our early spring warmth can be deceptive. Bottom watering is a great way to keep the soil consistently moist without disturbing the delicate seedlings.

Transplant your geraniums outdoors from early April through early May, after the last threat of a late freeze. 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.

Plant them 10-12 inches apart in well-draining soil. Keep an eye on the weather forecast; those early spring temperature swings can be tough on young plants. Honestly, due to how slow they are from seed, most of us Texas gardeners find it easier to buy starts.

Watering is key to keeping your geraniums happy in the Texas heat. They need moderate watering, but overwatering is a quick way to cause stem rot. Letting the soil dry slightly between waterings is crucial.

During the spring and fall, when temperatures are milder, you'll likely only need to water once or twice a week, depending on rainfall. In the peak of summer, especially when we're hitting those 97°F days, you might need to water every other day, or even daily if they're in containers. Stick your finger about two inches deep into the soil; 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 wetting the foliage, which can encourage fungal diseases, especially with our variable humidity. Signs of underwatering include wilting leaves and dry, crispy edges. Overwatering can cause yellowing leaves and mushy stems. A good layer of mulch helps retain moisture in the soil and regulate soil temperature, which is a big help during our hot summers.

Deadheading is essential for keeping your geraniums blooming throughout the season. Simply pinch or cut off the spent flower clusters just below the flower head. This encourages the plant to put its energy into producing new blooms instead of seeds.

Throughout the growing season, pinch back any leggy stems to promote bushier growth. As the first frost approaches around early November, you can give your geraniums a final trim to tidy them up before the cold weather sets in. You can also bring them indoors to overwinter if you want to try and keep them going for another season.

Geraniums are primarily grown for their beautiful flowers, so "harvesting" is more about enjoying the blooms in your garden. You can expect your first flowers to appear from mid-June through early August, about 70 days after starting from seed or transplanting.

The best sign that they're ready to "harvest" is when the flowers are fully open and vibrant. Simply remove faded blooms to keep the plant looking tidy and encourage continued flowering. This process keeps the plant producing new blooms throughout the growing season.

As the first frost approaches in early November, you can take cuttings to propagate new plants indoors, or simply enjoy the last of the blooms before the cold weather arrives.

Here are the top 3 problems you might encounter growing geraniums in Texas:

Botrytis Blight

• What it looks like: Grayish-brown mold on flowers, leaves, and stems, often starting with water-soaked spots.
• What causes it: High humidity and poor air circulation, which can be a problem during our periods of heavy rainfall or in overly crowded plantings.
• How to fix/prevent it: Improve air circulation by spacing plants properly and pruning out crowded growth. Remove and destroy infected plant parts immediately. Use a fungicide labeled for botrytis if the problem is severe, but prevention is key.

Geranium Budworm

• What it looks like: Small holes in buds and flowers, often accompanied by dark droppings. The budworms themselves are small, green caterpillars.
• What causes it: These caterpillars feed on the buds and flowers, causing damage that can ruin the blooms. They're more prevalent during periods of warm, humid weather.
• How to fix/prevent it: Inspect plants regularly for signs of budworms. Handpick them off if you find them. Bacillus thuringiensis (Bt) is an effective organic control option.

Edema

• What it looks like: Small, raised bumps or blisters on the undersides of leaves, often turning brown or corky.
• What causes it: Edema is caused by inconsistent watering and high humidity, leading to the plant taking up more water than it can transpire. This is common with our unpredictable rainfall.
• How to fix/prevent it: Improve drainage in the soil. Water consistently, avoiding both overwatering and underwatering. Provide good air circulation around the plants.

Texas-Specific Challenges: The hot-to-extreme Texas heat can stress geraniums, making them more susceptible to pests and diseases. Variable humidity can also create ideal conditions for fungal problems. Our unpredictable rainfall patterns can lead to both drought stress and overwatering issues, so consistent monitoring and adjustments to your watering schedule are essential.

Geraniums make excellent companions for a variety of plants in the Texas garden. They pair well with tomatoes and peppers because they can help deter certain pests that might bother these crops. Plus, they add a pop of color!

They also work well planted near corn, as they can attract beneficial insects that help pollinate the corn. Roses also benefit from geraniums, as the geraniums can help repel aphids, a common rose pest. Avoid planting geraniums near fennel, as it can inhibit their growth.