Wisconsin gardeners know that cold frames and early starts give herbs a fighting chance. If you’re looking for the best herbs to grow in Wisconsin, you’ve come to the right place. Our short growing season and chilly winters mean not every herb will thrive here, but many will surprise you with their hardiness. Let’s dig into the top picks for your Badger State garden.
Wisconsin’s climate is a mix of USDA zones 3b to 5b, with cold winters and warm summers. This means you need herbs that can handle frost and still produce well. The good news is that many culinary and medicinal herbs are naturally tough. You can grow them in containers, raised beds, or right in the ground.
Start your seeds indoors 6-8 weeks before the last frost date, which is typically mid-May for most of the state. Use a sunny windowsill or grow lights. Harden off your seedlings by setting them outside for a few hours each day before transplanting. This step is crucial for success.
Best Herbs To Grow In Wisconsin
This list focuses on herbs that tolerate cold, resist pests, and give you a bountiful harvest. Each one has been tested by Wisconsin gardeners and proven reliable. Let’s break them down by category.
Hardy Perennial Herbs For Wisconsin Winters
These herbs come back year after year, even after harsh winters. They need little care once established. Plant them in a sunny spot with well-drained soil.
Chives
Chives are one of the easiest herbs to grow in Wisconsin. They survive winter temperatures down to -30°F. You can plant them as soon as the soil is workable in spring. They produce purple flowers that are edible too. Harvest the leaves by cutting them at the base. They grow back quickly.
Thyme
Thyme is a low-growing perennial that thrives in poor soil. It’s drought-tolerant once established. In Wisconsin, choose English thyme or lemon thyme for best results. It stays green under snow and starts growing early in spring. Use it fresh or dried in soups and roasts.
Sage
Common sage is a woody perennial that handles Wisconsin winters well. It needs full sun and good drainage. In heavy clay soil, plant it in raised beds to prevent root rot. The leaves have a strong flavor that intensifies after frost. Harvest before the first hard freeze for the best taste.
Oregano
Greek oregano is the hardiest variety for Wisconsin. It spreads slowly and forms a dense mat. It’s perfect for borders or containers. The leaves are more flavorful after the plant flowers. Cut it back in fall to encourage new growth in spring.
Annual Herbs That Thrive In Wisconsin Summers
These herbs grow quickly in warm weather and die with frost. Start them indoors or buy transplants from local nurseries. They need consistent watering and full sun.
Basil
Basil loves heat but hates cold. In Wisconsin, plant it after all danger of frost has passed, usually late May or early June. Sweet basil, Genovese, and Thai basil all do well. Pinch off flower buds to keep the plant bushy. Harvest leaves regularly to encourage more growth.
Cilantro
Cilantro bolts quickly in hot weather. In Wisconsin, plant it in early spring or late summer for a fall harvest. It prefers cooler temperatures. Succession plant every 2-3 weeks for a steady supply. The leaves are used fresh, and the seeds (coriander) can be harvested later.
Dill
Dill is a cool-season annual that self-sows easily. Plant seeds directly in the garden after the last frost. It grows tall and feathery, so give it space. Use the leaves fresh for fish and salads. The seeds are great for pickling. Let some plants go to seed for next year’s crop.
Herbs That Prefer Partial Shade
Not every Wisconsin garden gets full sun. These herbs tolerate some shade and still produce well. They’re perfect for north-facing beds or under trees.
Mint
Mint is invasive but easy to grow. It spreads by runners, so plant it in a container or use a barrier. Peppermint and spearmint are both hardy in Wisconsin. They prefer moist soil and partial shade. Harvest leaves anytime for tea or cocktails. Be careful—it will take over if not contained.
Lemon Balm
Lemon balm is a mint relative with a lemony scent. It grows well in partial shade and moist soil. It’s perennial in Wisconsin, coming back each spring. Use the leaves fresh in teas or salads. It also attracts bees and butterflies. Cut it back after flowering to keep it tidy.
Parsley
Parsley is a biennial that grows as an annual in Wisconsin. It prefers cool weather and partial shade. Flat-leaf Italian parsley is more flavorful than curly types. Soak seeds overnight before planting to speed germination. It takes a while to sprout, so be patient. Harvest outer leaves first.
Herbs For Containers And Small Spaces
If you have limited space, container gardening is ideal. Many herbs grow well in pots on a patio or balcony. Use a quality potting mix and ensure drainage holes.
Rosemary
Rosemary is not winter-hardy in Wisconsin. It must be brought indoors before frost. Grow it in a container so you can move it easily. Use a sandy soil mix and water sparingly. Place it in a sunny window during winter. It’s worth the effort for its aromatic leaves.
Lavender
Lavender is tricky in Wisconsin due to wet winters. English lavender varieties like ‘Munstead’ and ‘Hidcote’ are more cold-tolerant. Plant in well-drained soil or raised beds. Mulch heavily in fall to protect roots. It needs full sun and good air circulation. The flowers are great for sachets and teas.
Tarragon
French tarragon is a perennial that does well in containers. It prefers light, sandy soil and full sun. In Wisconsin, it may die back in winter but usually returns in spring. Use the leaves fresh in chicken dishes and salads. It has a subtle anise flavor.
Step-By-Step Guide To Growing Herbs In Wisconsin
Follow these steps for a successful herb garden. Adjust based on your specific microclimate.
- Choose the right location. Most herbs need 6-8 hours of sun daily. Avoid low spots where frost settles.
- Prepare the soil. Herbs prefer well-drained soil with a pH of 6.0-7.0. Add compost to improve drainage and fertility.
- Start seeds indoors. For annuals like basil and dill, start seeds 6-8 weeks before last frost. Use seed-starting mix and keep them warm.
- Harden off seedlings. Gradually expose them to outdoor conditions over a week. Start with a few hours of shade, then increase sun exposure.
- Transplant after frost. Wait until soil temperatures are above 50°F. Space plants according to their mature size.
- Water wisely. Most herbs prefer consistent moisture but not wet feet. Water at the base to avoid leaf diseases.
- Mulch around plants. Use straw or shredded leaves to retain moisture and suppress weeds. Mulch also protects roots in winter.
- Harvest regularly. Pinch off leaves to encourage bushier growth. Harvest in the morning after dew dries for best flavor.
- Protect from frost. Cover tender herbs with row covers or bring containers indoors when frost is forecast.
- Prepare for winter. Cut back perennials after they die back. Mulch heavily with straw or leaves. Move tender perennials indoors.
Common Problems And Solutions For Wisconsin Herb Gardens
Even experienced gardeners face challenges. Here are typical issues and how to fix them.
Frost Damage
Late spring frosts can kill tender seedlings. Use cloches, row covers, or old milk jugs to protect them. Plant in raised beds to improve drainage and warmth. Choose cold-tolerant varieties when possible.
Poor Drainage
Wisconsin’s clay soil can hold too much water. Herbs like rosemary and lavender hate wet roots. Plant in raised beds or mounds. Add sand or perlite to improve drainage. Container gardening is a good alternative.
Pests
Aphids, slugs, and spider mites can attack herbs. Use insecticidal soap for aphids. Hand-pick slugs at night. Keep plants healthy to resist pests. Companion planting with marigolds or garlic can help.
Diseases
Powdery mildew is common in humid summers. Space plants for good air circulation. Water at the base, not overhead. Remove infected leaves promptly. Choose disease-resistant varieties.
Harvesting And Preserving Your Herbs
Proper harvesting ensures the best flavor and extends your harvest. Here’s how to do it right.
- Harvest in the morning after dew evaporates but before the sun gets hot.
- Use clean, sharp scissors or pruners to avoid damaging plants.
- Never take more than one-third of the plant at a time.
- For leafy herbs like basil and mint, pinch off the top leaves to encourage branching.
- For woody herbs like thyme and rosemary, cut stems just above a leaf node.
- Dry herbs by hanging them in small bundles in a dark, airy space. Or use a dehydrator on low heat.
- Freeze herbs like basil and dill in ice cube trays with water or olive oil.
- Store dried herbs in airtight jars away from light and heat.
Best Companion Plants For Herbs In Wisconsin
Companion planting can improve growth and deter pests. Here are some pairings that work well in Wisconsin.
- Basil with tomatoes: Basil repels tomato hornworms and improves flavor.
- Chives with carrots: Chives deter carrot flies and add nutrients.
- Dill with cabbage family: Dill attracts beneficial wasps that control caterpillars.
- Mint with brassicas: Mint repels cabbage moths, but keep it in a container.
- Oregano with peppers: Oregano attracts pollinators and repels spider mites.
- Sage with beans: Sage deters bean beetles and improves growth.
Herb Garden Design Ideas For Wisconsin Landscapes
Make your herb garden both functional and beautiful. Consider these design tips.
Raised Bed Herb Garden
Raised beds warm up faster in spring and drain better. Build them 6-12 inches high. Use untreated lumber or stone. Fill with a mix of topsoil, compost, and sand. Plant perennials like chives and thyme along the edges. Place annuals like basil in the center.
Container Herb Garden
Containers are perfect for small spaces. Use pots at least 8 inches deep with drainage holes. Group pots together for easy watering. Move them to follow the sun or protect from frost. Use a lightweight potting mix.
Herb Spiral
An herb spiral is a vertical garden that creates microclimates. Build it with stones or bricks. The top is dry and sunny for rosemary and thyme. The bottom is moist and shady for mint and parsley. This design saves space and looks great.
Winter Care For Wisconsin Herb Gardens
Wisconsin winters are harsh, but with proper care, many herbs survive. Here’s what to do.
- Cut back perennial herbs like chives and oregano after the first frost.
- Mulch heavily with straw, leaves, or evergreen boughs. Apply 4-6 inches after the ground freezes.
- Water evergreens like rosemary indoors sparingly. They need less water in winter.
- Bring container herbs indoors before the first hard frost. Place them in a sunny window.
- Check for pests before bringing plants inside. Treat with insecticidal soap if needed.
- In spring, remove mulch gradually as temperatures warm. Watch for new growth.
Frequently Asked Questions
What are the easiest herbs to grow in Wisconsin for beginners?
Chives, mint, and thyme are the easiest. They need little care and survive winter well. Start with these if you’re new to gardening.
Can I grow rosemary outdoors in Wisconsin year-round?
No, rosemary is not winter-hardy in Wisconsin. It must be grown in a container and brought indoors before frost. With care, it can live for years inside.
When should I plant herbs in Wisconsin?
Start seeds indoors in March or April. Transplant after the last frost, usually mid-May. For cool-season herbs like cilantro and dill, plant in early spring or late summer.
How do I protect herbs from Wisconsin’s cold winters?
Mulch perennials with straw or leaves after the ground freezes. Use row covers for tender plants. Move container herbs indoors. Choose hardy varieties like chives and sage.
What herbs grow best in partial shade in Wisconsin?
Mint, lemon balm, and parsley do well in partial shade. They need less sun than most herbs but still produce well. Avoid full shade for best results.
Final Tips For A Successful Wisconsin Herb Garden
Start small and expand as you gain experience. Focus on herbs you use most in cooking. Keep a garden journal to track what works and what doesn’t. Share extra harvest with neighbors or dry them for winter use. Remember that even experienced gardeners face setbacks. Learn from each season and adjust your approach. With the right choices and care, you can enjoy fresh herbs from spring through fall, and even indoors during winter. Happy gardening in the Badger State!