Geranium in Zone 8B — Florida

Geraniums bring a vibrant splash of color to our Florida gardens, especially when many other flowers struggle with the heat. Their cheerful blooms are perfect for containers, borders, or adding pops of color to your landscape. Plus, deadheading spent flowers is a satisfying task that keeps them blooming.

While our subtropical climate presents challenges like high humidity and fungal diseases, the timing for growing geraniums here actually works in our favor. By starting seeds indoors and transplanting after our last frost, you can enjoy beautiful blooms throughout our long, 303-day growing season.

Starting geranium seeds indoors can give you a head start, but honestly, they're pretty slow to get going. Unless you're after a specific variety, you'll probably find it easier to buy established transplants from a local nursery.

If you're determined to start from seed, sow them late November through late December, about 12 weeks before you plan to transplant. Use seed trays with a good seed-starting mix, keep them warm (around 70-75°F), and provide plenty of light, either from a sunny window or a grow light. Bottom watering is a good way to keep the soil moist without damping off. Remember, our spring here is reversed, so we're starting these when other gardeners up north are winding down!

Transplant your geranium seedlings outdoors in early to late March, after the danger of frost has passed. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week.

Space them 10-12 inches apart in a sunny spot with well-draining soil. Be aware that even in March, we can still have temperature swings, so keep an eye on the forecast and be prepared to cover them if a cold snap threatens. Honestly, buying established transplants will save you time and give you a jump start in our sometimes unpredictable spring weather.

Watering is critical for geraniums in Florida's humid climate. While they need consistent moisture, overwatering is a common problem that can lead to stem rot. Let the soil dry out slightly between waterings – stick your finger about 2 inches deep into the soil; if it feels dry, it's time to water.

During the cooler months, you might only need to water once or twice a week, giving them about an inch of water each time. But during our hot, humid summers, you may need to water more frequently, especially if they're in containers. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid environment.

Keep an eye out for signs of underwatering, like wilting leaves, or overwatering, like yellowing leaves and soggy soil. A layer of mulch around the base of the plants can help retain moisture and suppress weeds, just be sure to keep it away from the stems to prevent rot.

Regular pruning will keep your geraniums blooming beautifully throughout the season. The most important thing is to deadhead spent flower clusters as soon as they start to fade. Simply pinch or cut off the entire flower stem just above a leaf node.

Throughout the growing season, you can also pinch back any leggy stems to encourage bushier growth and more flowers. As our first frost approaches around mid- December, you can give your geraniums a final trim to tidy them up before the cooler weather sets in.

While you're not exactly "harvesting" geraniums for food, you are harvesting their beauty! Expect your first blooms to appear from early May through late June, about 70 days after transplanting.

The key to a continuous display of flowers is regular deadheading. Remove faded blooms as soon as you see them – this encourages the plant to produce more flowers instead of putting energy into seed production. Simply snip off the spent flower heads with clean pruners.

As the weather cools down in late fall (around mid- December), you can either let your geraniums go dormant or try to overwinter them indoors. If you choose to overwinter, cut them back hard and bring them inside to a bright, cool location.

Here are some common problems you might encounter with geraniums in Florida:

Botrytis Blight *What it looks like:* Grayish-brown fuzzy mold on flowers, leaves, and stems. *What causes it:* High humidity and poor air circulation create the perfect environment for this fungal disease. Our wet-summer rainfall and humid air are breeding grounds for blight. *How to fix/prevent it:* Improve air circulation by spacing plants properly. Water at the base of the plant to avoid wetting the foliage. Remove and destroy infected plant parts promptly. Consider using a fungicide if the problem is severe.

Geranium Budworm *What it looks like:* Holes in buds and flowers, chewed leaves, and small green caterpillars (budworms) present. *What causes it:* These caterpillars feed on geranium buds and flowers, causing damage. *How to fix/prevent it:* Handpick budworms when you see them. Use Bacillus thuringiensis (Bt), a biological insecticide, to control budworms. Regularly inspect your plants for signs of infestation.

Edema *What it looks like:* Small, water-soaked blisters or bumps on the undersides of leaves. *What causes it:* Edema is caused by excessive moisture in the soil and cool temperatures, which can happen during our cooler, wetter periods. *How to fix/prevent it:* Improve drainage in your soil. Avoid overwatering, especially during cool weather. Ensure good air circulation around the plants.

Florida Specific Challenges: Our hot, humid summers and sandy soil can make growing geraniums a bit challenging. The extreme humidity encourages fungal diseases, and our sandy soil drains quickly, so you'll need to water regularly. Choosing disease-resistant varieties and providing good air circulation will help your geraniums thrive in our unique Florida climate.

Geraniums make great companions for several plants in your Florida garden. They pair well with tomatoes and peppers, as they are believed to repel certain pests that can affect these crops. The strong scent of geraniums can also deter cabbage moths, which can be a problem for corn. Roses also benefit from geraniums planted nearby, as they may help to prevent Japanese beetles. Avoid planting geraniums near fennel, as it can inhibit their growth.