Geranium in Zone 9B — Florida

Geraniums offer a vibrant splash of color to your Florida garden, thriving during our mild winters and adding beauty to container gardens and borders alike. Their cheerful blooms bring a touch of elegance, and the satisfaction of growing them is amplified by our extended growing season, allowing for months of enjoyment.

While Florida's humidity and potential for fungal diseases can pose challenges, careful timing and attention to watering will help your geraniums flourish. Our reversed growing season gives you a head start, and with a 344-day growing season, you have plenty of time to enjoy their beauty.

Starting geraniums from seed indoors in Florida is possible, but it's a slow process. If you're up for the challenge, begin in early to late November, about 12 weeks before you plan to transplant them outdoors.

Use seed trays with a good seed-starting mix, providing warmth and plenty of light. Bottom watering is a great way to keep the soil consistently moist without overwatering, which is especially important in our humid climate. Remember, our spring character is reversed; you're starting seeds as the rest of the country winds down.

Transplant your geranium seedlings outdoors from early February through early March. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Florida sunshine and temperatures.

Space your plants 10-12 inches apart in well-draining soil. Be mindful of potential temperature swings during this time of year. Honestly, buying starts from a local nursery is often the easiest route for geraniums, given how slowly they grow from seed.

Watering geraniums correctly is essential, especially in Florida's humid climate. While they need moderate watering, they are not drought-tolerant, and overwatering can quickly lead to stem rot. Let the soil dry slightly between waterings.

During our typically drier spring and fall, check the soil moisture using the "finger test"—stick your finger about 2 inches deep. If it feels dry, it's time to water. Aim for about 1 inch of water per week, adjusting based on rainfall. In our wet-summer months, you may not need to water at all. Water at the base of the plant to avoid wetting the foliage, minimizing the risk of fungal diseases in our humid air.

Signs of underwatering include wilting leaves and dry soil, while overwatering can cause yellowing leaves and soggy soil. A layer of pine straw mulch can help retain moisture and suppress weeds, but avoid piling it up against the stems, which can encourage rot.

Regular pruning keeps your geraniums looking their best and encourages more blooms. Deadheading is crucial; simply pinch off spent flower clusters as they fade. This directs the plant's energy into producing new flowers instead of seeds.

Throughout the growing season, pinch back any leggy stems to promote a bushier growth habit. As our first frost approaches around late December, you can give your geraniums a final trim to tidy them up before the cooler weather sets in.

In Florida, you can expect your first geranium blooms from mid April through early June, about 70 days after transplanting. While you won't be "harvesting" anything edible, enjoy the flowers as they brighten your garden. Remove faded blooms regularly for a neat appearance and to encourage continued flowering.

Geraniums offer continuous blooms throughout the growing season, so keep deadheading those spent flowers. As late December approaches and the threat of frost looms, you can bring container geraniums indoors to overwinter or take cuttings to propagate new plants.

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

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 create ideal conditions for this fungal disease. Common during our wet-summer.
• How to fix/prevent it: Improve air circulation by spacing plants adequately and pruning out crowded growth. Avoid overhead watering, and apply a fungicide if necessary.

Geranium Budworm

• What it looks like: Holes in buds and flowers, often accompanied by small, green caterpillars.
• What causes it: These caterpillars feed on geraniums, causing damage to buds and flowers.
• How to fix/prevent it: Handpick caterpillars when you see them. Use insecticidal soap or Bacillus thuringiensis (Bt) to control infestations.

Edema

• What it looks like: Small, blister-like bumps on the undersides of leaves, which can turn brown and corky.
• What causes it: Edema is caused by excessive moisture in the soil and humid air, leading to cells bursting.
• How to fix/prevent it: Improve drainage and air circulation. Avoid overwatering, especially during periods of high humidity.

Florida Specific Challenges: Florida's hot heat, very-high humidity, and wet-summer rainfall create a perfect storm for fungal diseases and pest problems in geraniums. Regular monitoring and proactive measures are essential to keep your plants healthy and thriving.

Geraniums make good companions for several plants in your Florida garden. They are said to deter certain pests from tomatoes, peppers, and corn. Planting them near roses can also help protect the roses from Japanese beetles.

Avoid planting geraniums near fennel, as it can inhibit their growth.