Geranium in Zone 5B — Great Plains

Geraniums are a classic for a reason. Their vibrant colors brighten up any garden or container, and they’re relatively low-maintenance, offering blooms all summer long. Plus, their strong scent can help deter some pests from your other plants. They thrive in our intense Plains sunshine.

Growing geraniums in our Zone 5B climate can be done successfully, but it takes a bit of planning. Our extreme temperature swings and occasional hail are definitely factors to consider. With a 178-day growing season, timing is important, but you can absolutely enjoy these beauties with a little preparation.

Starting geraniums from seed indoors is an option, but honestly, it's a slow process. You'll want to get going early -- anytime from early to late February, which is about 12 weeks before you can safely transplant them outside. This can give you a jump start.

Use seed trays with a good seed-starting mix and keep them consistently warm. Bottom watering is key to avoid damping off – just set the tray in a shallow dish of water and let the soil soak it up. A grow light will really help, especially with our variable spring weather; it's hard to count on consistent natural light that early.

Transplanting is best done from early May through early June, after the last frost. Since geraniums are slow from seed, many Plains gardeners find it easier to buy starts from a local nursery. Either way, be sure to harden them off for about a week before planting by gradually exposing them to outdoor conditions.

Plant them about 10-12 inches apart in a sunny spot with well-drained soil. Keep an eye on the forecast – a late frost or unexpected hailstorm can still happen. Wind protection is essential, especially when they're young.

Geraniums like consistent moisture, but they definitely don't like soggy feet. In our Great Plains climate, you have to be mindful of our variable rainfall and hot summers. 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 hotter parts of summer, you might need to water deeply a couple of times a week, providing about an inch of water each time. With our low-to-moderate humidity, watering at the base of the plant is usually fine. Avoid overhead watering to prevent fungal diseases.

Yellowing leaves can be a sign of overwatering, while wilting leaves mean they're thirsty. A good layer of mulch around the base of the plants will help retain moisture and keep the soil cooler during those scorching days.

Deadheading is essential for keeping your geraniums blooming all season long. 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.

If your geraniums start to look leggy, especially later in the season, you can pinch back the stems to encourage bushier growth. As the first frost approaches in mid-October, stop deadheading to allow the plant to prepare for dormancy.

Geraniums aren't really a "harvest" crop in the traditional sense. You're growing them for their beautiful flowers, which you can enjoy all summer long. Expect your first blooms starting in mid-July, continuing through late August.

The best indicator that it's time to "harvest" is when the blooms are fully open and vibrant. Snip off faded blooms to keep the plant looking tidy and encourage more flowering. This continuous harvest will keep your plants producing until the first frost. As mid-October nears, let the last blooms fade naturally.

Geraniums are generally pretty hardy, but they can be susceptible to a few problems in our Great Plains climate. Here are three to watch out for:

Botrytis Blight

• What it looks like: Grayish-brown mold on leaves, stems, and flowers.
• What causes it: High humidity and poor air circulation. This can happen during periods of prolonged rain or if plants are too crowded.
• How to fix/prevent it: Improve air circulation by spacing plants properly. Remove and destroy infected plant parts immediately. Avoid overhead watering, and consider a fungicide if the problem is severe.

Geranium Budworm

• What it looks like: Holes in buds and flowers, often with dark droppings nearby.
• What causes it: These caterpillars are active during warm weather. They feed on the buds and flowers, causing significant damage.
• How to fix/prevent it: Handpick the caterpillars off the plants. Insecticidal soap or Bacillus thuringiensis (Bt) can also be effective.

Edema

• What it looks like: Small, water-soaked blisters on the undersides of leaves.
• What causes it: Overwatering and poor drainage. It's more common during cool, cloudy weather when the plants aren't actively growing.
• How to fix/prevent it: Improve drainage by amending the soil with compost or perlite. Water less frequently, and make sure the plants are in a well-ventilated area.

Great Plains Specific Challenges: Our hot summers can stress geraniums, making them more susceptible to pests and diseases. The variable rainfall means you need to be vigilant about adjusting your watering schedule. Wind protection is essential to prevent damage to the plants, especially when they're young.

Geraniums can be good companions for several plants in your Great Plains garden. They're often planted near tomatoes, peppers, and corn because their scent is thought to deter certain pests, like tomato hornworms and aphids, which can be a real problem in our climate.

They also work well near roses, as they can help repel Japanese beetles. Avoid planting them near fennel, as it can inhibit their growth.