The Truth Behind the Viral "3-Hour Warning" for Gardeners (2024)

Britain is known for introducing us the best of the best — think Princess Diana, Harry Potter and fish and chips. Now we can thank the UK for bringing us a fantastic sun safety idea: the 3-hour-gardening rule.

The concept is simple: don’t go out in the sun to tend to your plants during its strongest rays, which generally occurs between 11 AM and 2 PM. After British gardener Shannen Goodwin explained that the 3-hour gardening rule can offer powerful protection from sun-related health problems, the internet took note and the idea went viral.

Really, though, the 3-hour rule is just excellent common sense. “I treat many skin cancers on gardeners on their hands, arms, ears and neck,” says Ellen S, Marmur, MD, clinical professor of dermatology at Mount Sinai School of Medicine and founder of Marmur Medical in New York City. Not to mention the fact that too much sun can adversely affect the rest of your body: think dehydration, heat exhaustion or sunstroke.

Many gardening pros already follow the rule religiously. “Unless I'm in the middle of a big project, I'm not outside working in the heat of the day,” says Tara Nolan, co-owner of Savvy Gardening and author of Gardening in Your Front Yard. “If I am working on a project, I'll only stay in the sun for a couple of hours at a time, well covered.”

How can you adopt the 3-hour rule effectively and easily — and still find enough time in the day to spoil your roses rotten? Use these 6 key tips, and then get your bloom on!

Editor's note: Here’s how to interpret the index: UV Index 0-2 means sun exposure danger is at a minimum. UV Index 6-7 means moderate risk of harm from the sun. UV Index 8-10 means high risk of sunburn and sun damage. UV Index of 11+ means a very high risk to your health from the sun.

Remember, gardening is lots of fun — and has a lot of health benefits associated with it — but only when done safely.