Geranium in Zone 4B — Great Plains

Geraniums are a classic for a reason, bringing vibrant color to our Great Plains gardens all summer long. Their tolerance for heat (a real asset here!) and relatively low-maintenance needs make them a rewarding choice, whether you're filling containers or adding pops of color to your flower beds. The mild summer nights and intense sunshine we get on the Plains really make them thrive.

While our region's extreme weather can be a challenge, timing your Geranium planting correctly can help you enjoy their beauty for as long as possible during our 149-day growing season. Wind protection is essential for these somewhat delicate plants, so plan your garden accordingly.

Starting Geraniums from seed indoors is definitely an option, but honestly, they are slow growers. Unless you're really looking for a specific variety, you might find it easier to buy starts from a local nursery.

If you're set on starting from seed, aim for mid February through early March, roughly 12 weeks before you plan to transplant outdoors. Use seed trays with a good seed-starting mix, keep them warm (around 70-75°F), and provide plenty of light – a grow light works best. Remember to water from the bottom to avoid damping off. Spring on the Plains can be so variable, so be prepared to adjust your schedule if we get a late cold snap.

Transplant your Geraniums outdoors mid May through mid June, after the risk of frost has passed. Be sure to harden them off first by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the Plains' intense sunshine and wind.

Plant them 10-12 inches apart in a sunny spot with well-drained soil. Keep an eye on the weather forecast around transplant time – we can still get some pretty wild temperature swings in May. Honestly, Geraniums are slow from seed, so buying starts is generally the easiest route for most Plains gardeners.

Geraniums like consistent moisture, but they definitely don't want to be waterlogged. In our Plains climate, where we can swing from dry spells to heavy thunderstorms, it's crucial to pay attention to the soil. During the hottest part of the summer, you might need to water them every few days, but always 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. Aim for about an inch of water per week, either from rainfall or irrigation. Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our low-to-moderate humidity.

Signs of underwatering include wilting leaves and dry, cracked soil. Overwatering can lead to yellowing leaves and stem rot. A good layer of mulch, like shredded bark, will help retain moisture and regulate soil temperature, which is really helpful given our extreme temperature swings.

Deadheading is key to keeping your Geraniums blooming throughout the season. Simply pinch or snip 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 summer, you can also pinch back any leggy stems to encourage bushier growth. As the first frost approaches in early October, you can stop deadheading and let the plants set seed, or you can bring them indoors to overwinter as houseplants.

You're not really "harvesting" Geraniums for food, but rather enjoying them as beautiful garden flowers. Expect your first blooms in late July through mid September, about 70 days after transplanting.

Keep an eye out for faded blooms and remove them regularly. This encourages continuous flowering and keeps the plants looking tidy. To remove the blooms, simply pinch or snip off the spent flower clusters just below the flower head.

As the first frost approaches in early October, consider taking cuttings from your favorite plants to propagate new ones indoors over the winter. Otherwise, you can let the plants go to seed, or simply compost them.

Here are a few common problems you might encounter with Geraniums in the Great Plains:

Botrytis Blight

• What it looks like: Grayish-brown mold on leaves, stems, and flowers, often starting on damaged or dead tissues.
• What causes it: High humidity and cool temperatures, especially during wet springs or falls. Our variable rainfall can make this tricky.
• How to fix/prevent it: Improve air circulation by spacing plants properly. Remove and destroy infected plant parts. Avoid overhead watering. A fungicide can be used as a last resort.

Geranium Budworm

• What it looks like: Holes in buds and flowers, chewed leaves, and small, greenish-brown caterpillars.
• What causes it: These caterpillars feed on Geraniums. Moths lay eggs on the plants.
• How to fix/prevent it: Handpick caterpillars when you see them. Use Bacillus thuringiensis (Bt), a biological insecticide, to control infestations. Keep an eye out for them, especially after a warm spell.

Edema

• What it looks like: Small, water-soaked blisters or bumps on the undersides of leaves, which can turn brown or corky.
• What causes it: Excessive moisture in the soil combined with cool temperatures and high humidity.
• How to fix/prevent it: Improve drainage by planting in well-draining soil. Water less frequently and avoid overhead watering. Ensure good air circulation around the plants. This can be tricky with our variable rainfall.

Great Plains Specific Challenges: Our combination of hot heat, low-to-moderate humidity, and variable rainfall can create a challenging environment for Geraniums. Be vigilant about monitoring your plants for signs of stress and adjust your watering and care accordingly. Wind protection is also essential to prevent damage to these somewhat delicate plants.

Geraniums make great companions for several plants in the Great Plains garden. They are said to repel certain pests, which benefits:

• Tomatoes and Peppers: Geraniums can help deter tomato hornworms and pepper weevils.
• Corn: Planting Geraniums around corn can help repel Japanese beetles.
• Roses: Geraniums are believed to repel aphids from roses.

Avoid planting Geraniums near plants that prefer consistently moist soil, as Geraniums prefer to dry out slightly between waterings. This is especially important in our region, where we can experience periods of drought followed by heavy rainfall.