Geranium in Zone 3A — Great Plains

Geraniums are a classic for a reason, and they earn their place in any Great Plains garden. Their bright blooms bring cheerful color to our yards, and they're tough enough to handle our intense sunshine. Plus, they attract pollinators, which is always a win!

Our region definitely throws some curveballs – extreme temperature swings and the occasional hail storm are just part of the deal. But with a little planning and attention to timing, you can absolutely enjoy beautiful geraniums in our 108-day growing season.

Starting geraniums from seed indoors is possible, but honestly, it can be a bit slow-going. If you're set on starting from seed, begin in early to late March, giving them about 12 weeks indoors before transplanting. Use seed trays with a good seed-starting mix.

Keep the trays consistently warm and provide plenty of light – a grow light is really helpful. Bottom watering is a great way to keep the soil moist without overwatering. Spring weather can be variable here, so be prepared to adjust your setup as needed.

Honestly, many Plains gardeners find it easier to buy geranium starts from a local nursery. You'll get a head start and avoid the slow germination process.

Transplant your geraniums outdoors in early to mid June, after the risk of frost has passed. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week. Start with an hour or two of shade, then slowly increase the time and sun exposure each day.

Plant them 10-12 inches apart in well-draining soil. At transplant time, keep an eye on the forecast. We can still get some chilly nights or even a late frost, so be ready to cover your plants if needed. Remember, geraniums are tender and won't tolerate freezing temperatures. Buying starts is a great way to ensure you have blooming plants this year!

Watering is critical for geraniums in our Great Plains climate, especially with our variable rainfall. While they're not drought-tolerant, they also don't like soggy feet. Let the top inch or two of soil dry out slightly between waterings.

During the hotter summer months, you'll likely need to water them more frequently, possibly every few days. A good rule of thumb is to give them about an inch of water per week, either from rainfall or supplemental watering. Use the "finger test" – stick your finger about two inches into the soil to check the moisture level.

Water at the base of the plant to avoid getting the foliage wet, especially with our low-to-moderate humidity. Overwatering can lead to stem rot, so watch out for yellowing leaves or a mushy stem base. Underwatering will cause wilting and dry, crispy leaves. A layer of mulch around the base of the plants can help retain moisture and regulate soil temperature.

Pruning geraniums is simple and helps keep them blooming all season long. The key is to deadhead spent flower clusters regularly. Just snip off the faded blooms where they meet the stem.

This encourages the plant to produce more flowers instead of putting energy into seed production. If you notice any leggy stems, you can also pinch them back to encourage bushier growth. Do this throughout the growing season.

As our first frost approaches in early September, stop deadheading and let the last blooms fade naturally. This signals the plant to prepare for dormancy.

You won't be "harvesting" geraniums in the traditional sense like you would with vegetables. Instead, your harvest is the enjoyment of their beautiful blooms! Expect your first blooms from mid August through early September if starting from seed, but earlier if you buy starts.

The flowers don't really "ripen," but you'll know they're ready to enjoy when they're fully open and vibrant. Simply enjoy the flowers in your garden. Remove faded blooms regularly to keep the plants looking tidy and encourage continued flowering.

As the end of the season approaches and the first frost looms, you can bring potted geraniums indoors to overwinter, or take cuttings to propagate new plants. Sadly, they won't survive the winter outdoors here on the Plains.

Even with the best care, geraniums can sometimes run into problems. Here are three common issues we see in the Great Plains:

Botrytis Blight

• What it looks like: Grayish-brown mold on leaves, stems, and flowers, often starting with water-soaked spots.
• What causes it: This fungal disease thrives in cool, damp conditions and poor air circulation. Our extreme temperature swings and occasional periods of high humidity can contribute.
• How to fix/prevent it: Remove and destroy affected plant parts immediately. Improve air circulation by spacing plants properly. Avoid overhead watering, and consider a fungicide if the problem is severe.

Geranium Budworm

• What it looks like: Holes in buds and flowers, and small, green caterpillars feeding on the plant.
• What causes it: These caterpillars are the larvae of moths that lay their eggs on geraniums.
• How to fix/prevent it: Handpick caterpillars when you see them. Insecticidal soap or Bacillus thuringiensis (Bt) can be effective for controlling infestations.

Edema

• What it looks like: Small, blister-like bumps on the undersides of leaves.
• What causes it: Edema is caused by inconsistent watering and cool, humid conditions. When the soil is too wet, the plant takes up more water than it can transpire, causing cells to burst.
• How to fix/prevent it: Improve drainage by ensuring your soil is well-draining. Water consistently, allowing the soil to dry slightly between waterings. Improve air circulation around the plants.

Great Plains Specific Challenges: Our hot summers can stress geraniums, making them more susceptible to pests and diseases. Variable rainfall means you need to be vigilant about watering, adjusting your schedule based on the weather. Wind protection is essential to prevent damage to the delicate stems and flowers.

Geraniums make great companions for several plants in a Great Plains garden. They're known to repel certain pests, making them beneficial to:

• Tomatoes and Peppers: Geraniums deter tomato hornworms and other pests that can damage these crops.
• Corn: Geraniums can help repel corn earworms, which can be a nuisance.
• Roses: Geraniums can help deter Japanese beetles, which can be a problem for roses.

Avoid planting geraniums near:

• (No specific bad companions for Geraniums)