Gardeners make real decisions based on what they read here: what to buy, where to plant it and whether it is safe around pets. These standards explain how we research, check, write and update every article on Perennial Plants.
Our Sources
We base our articles on authoritative, independent sources. In order of preference, those are university extension services and horticulture departments, public botanical gardens and arboretums, government agencies such as the USDA and Natural Resources Canada, and nonprofit organizations with relevant expertise, such as the ASPCA for plant toxicity to pets.
We do not use retailers, nurseries or other gardening websites as sources for facts, and we do not link to them as references. When sources disagree, for example on a plant’s hardiness range, we say so or use the more conservative figure.
How We Check Facts
The facts readers rely on most are checked against at least one authoritative source before an article is published. These include hardiness zones, height and spread, bloom time, sun and soil needs, deer resistance, native range and toxicity to pets.
Articles end with a Sources list naming the references we used, with links so you can read them yourself. We are adding Sources lists to our earliest articles as we review and update them.
How We Write
Every article starts with a direct answer to the question it covers, then explains the detail behind it. We write for home gardeners rather than specialists, define technical terms when we use them, and give both common and botanical names so you can find the right plant at a nursery.
Where advice depends on climate, we say which zones or conditions it applies to. We avoid absolute promises, since plants respond to soil, weather and microclimate as much as to care.
How We Use AI Tools
We use AI tools to help research topics and draft articles. Every article is reviewed and edited by our editor, and its key facts are checked against the sources listed at the end before it is published. AI tools do not publish anything on this site on their own.
Updates and Corrections
Gardening knowledge changes as new research, varieties and climate data arrive, so we review and update articles over time. The date shown under each article title is the date it was last updated.
If you find an error, please tell us through our contact page. We check every reported error against our sources and correct confirmed mistakes promptly. When a correction changes advice in a meaningful way, such as a hardiness range or a toxicity warning, we note the correction in the article.
Independence
Perennial Plants is published by FourthMedia, Inc., an independent publisher. We are not owned by or affiliated with any nursery, seed company or garden retailer, and we do not accept payment to feature, review or recommend plants or products. If we ever include affiliate links or sponsored content, we will label it clearly on the page.
Safety Information
Our articles include toxicity information for pets based on the ASPCA’s list of toxic and non-toxic plants. This information is a guide, not veterinary advice. If you think a pet has eaten a toxic plant, contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 right away.