Geranium in Zone 6A — Midwest

Geraniums are a Midwest garden staple, bringing vibrant color and classic charm to our yards. Their versatility shines whether you're filling containers, edging a garden bed, or simply enjoying their beauty in a vase. Plus, they're surprisingly unfussy once established, rewarding you with blooms all summer long.

Our Midwest weather can be a bit unpredictable, from late frosts to summer heat spells. But with a little planning and attention to timing, you can absolutely grow beautiful geraniums. Our 178-day growing season gives them plenty of time to thrive.

Starting geraniums from seed indoors is possible, but honestly, it can be a slow process. If you're up for a challenge and want a specific variety, go for it. Start your seeds in early to late February, about 12 weeks before you plan to transplant them 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 wonders, especially with our moderate-to-late spring starts here in the Midwest. Water gently from the bottom to avoid damping off.

The easiest route for most Midwest gardeners is to buy geranium starts from a local nursery. But if you've started your own or found some online, aim to transplant them outdoors in early May through early June, after any risk of frost has passed.

Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. Plant them 10-12 inches apart in well-draining soil. Keep an eye on the weather forecast – a late frost can still happen, so be ready to cover them if needed.

Geraniums like consistent moisture, but they definitely don't like soggy feet. Here in the Midwest, with our wet summers and moderate-to-humid conditions, it's crucial to let the soil dry out slightly between waterings to prevent stem rot.

During the spring and early summer, when temperatures are milder, water deeply once or twice a week, giving them about an inch of water each time. Use the finger test – stick your finger about 2 inches into the soil. If it feels dry, it's time to water. As summer heat spells hit, you might need to water more frequently.

Water at the base of the plant rather than overhead, especially with our moderate-to-humid summers. Wet foliage can encourage fungal diseases. If the leaves start to yellow and droop, you're probably overwatering. If they wilt and the soil is dry, they need more water. A layer of mulch around the base of the plants helps retain moisture and keep the soil cool.

Deadheading is key to keeping your geraniums blooming all season long. Simply pinch or snip off the faded flower clusters right where the stem meets the main plant.

Throughout the summer, you can also pinch back any leggy stems to encourage bushier growth. As we approach the first frost around mid- October, stop deadheading and let the last blooms fade naturally. This signals the plant to prepare for dormancy.

Since geraniums are primarily grown for their beautiful flowers, "harvesting" is more about maintaining their appearance and encouraging continued blooming. Expect your first blooms to appear in mid July through late August, about 70 days after planting.

Simply remove faded or dead flowers regularly to keep the plants looking tidy and encourage more blooms. There's no real "ripening" process – just enjoy the flowers as they come!

As the first frost approaches in mid- October, you can bring your geraniums indoors to overwinter them, or simply let them fade naturally in the garden.

Here are some common problems you might encounter growing geraniums in the Midwest:

Botrytis Blight

• What it looks like: Grayish-brown mold on flowers, leaves, and stems.
• What causes it: High humidity and poor air circulation, which we can definitely get during our Midwest summers.
• How to fix/prevent it: Improve air circulation by spacing plants properly. Remove infected plant parts immediately. Avoid overhead watering, and consider a fungicide if the problem is severe.

Geranium Budworm

• What it looks like: Small holes in buds and flowers, often with dark droppings nearby.
• What causes it: Caterpillars that feed on the buds and flowers.
• How to fix/prevent it: Inspect plants regularly for signs of caterpillars. Handpick them off if you find them. Bacillus thuringiensis (Bt) is an effective organic control.

Edema

• What it looks like: Small, blister-like bumps on the undersides of leaves.
• What causes it: Overwatering and cool, cloudy weather.
• How to fix/prevent it: Improve drainage and avoid overwatering. Provide good air circulation. Edema is more common during our variable Midwest springs.

Midwest Specific Challenges: Our moderate-to-hot heat, moderate-to-humid humidity, and wet-summer rainfall can create favorable conditions for fungal diseases like botrytis blight. Be sure to provide good air circulation and avoid overwatering to keep your geraniums healthy.

Geraniums make great companions for several plants in the Midwest garden. Plant them near tomatoes, peppers, and corn to help repel certain pests. They also pair well with roses, adding a touch of color and helping to deter Japanese beetles. Avoid planting geraniums near fennel, as they can inhibit each other's growth.