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National Integrated Pest Management Network
This site shows general info on IPM, but allows you to get specific by picking a pest or a commodity.
Texas A&M University
Wildflowers in Bloom: Wildflowers
Start wildflowers from seed, find out what your hardiness zone is, learn about seed germination and sunlight needs of plants. All this and more.
Cornell Lab of Ornithology
Habitat Network: Take Control of Herbicide Use on Your Property
Here's what you need to know to make an informed choice on the best strategy to tackle backyard weeds.