What's Happening in Horticulture? September 2025 |
Greetings gardeners,
September is here, and with it come cooler nights, golden light, and full harvest baskets. While this is a time to savor the season’s bounty, it’s also a reminder to keep an eye out for changes in our landscapes. Recently, Japanese stiltgrass was detected in Wisconsin for the first time, an invasive plant that can crowd out forests, lawns, gardens, and other natural ecosystems. Staying aware of emerging threats helps us protect the places where we live, work, and play. Read on for timely tips and resources to make the most of your garden before fall.
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Green Thumb Gardening: Spring Bulbs
Thursday, Sept. 18 | 5:30-7:30 p.m. | $12 registration - Ask Your Gardening Question: LIVE
Monday, Sept. 22 | 1:30-2:30 p.m. | Free - Urban Forestry Workshop: Invasive Species Plant ID & Management
Sept. 23, 24, Oct. 1, 2, 7 | Multiple locations | $40 registration -
The Bad and the Ugly: Ten Plant Diseases Not to Compost
Wednesday, Sept. 24 | 6:30-8:30 p.m. | Free - Green Thumb Gardening: Ornamental Grasses, Sedges, and Rushes
Thursday, Sept. 25 | 5:30-7:30 p.m. | $12 registration
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Timely Webinars for Wisconsin Gardeners |
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Fall is a great time to plant bulbs for spring beauty. In this webinar, you’ll learn essential tips on how to select the perfect bulbs, correctly plant them, and protect new plantings. ▶︎ Watch Now
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In this webinar, you will learn why fall is an optimal time to plant and which species are best suited for fall planting. You'll also learn important considerations when choosing a tree species and nursery stock. ▶︎ Watch Now
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Whether you are a garden enthusiast, a foodie, or both, garlic is well known around the world! In this webinar you will learn techniques for growing garlic from planting to storage. ▶︎ Watch Now
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Fall is a key time for many maintenance activities that support a lush, healthy lawn. Learn about fertilizer recommendations, aeration and overseeding, weed control, and more. ▶︎ Watch Now
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A weekly column of horticulture education and activities for Wisconsin gardeners. Read the latest articles from this past month.
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| Garden myths: believe or bust. Should you torch tent caterpillars? Find out here.
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UW-Madison Division of Extension Horticulture Program
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The University of Wisconsin–Madison Division of Extension provides equal opportunities in employmentÂ
and programming in compliance with state and federal law.
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