Gardening myths — we all have heard one or the other through our gardening journey — whether passed down through generations from family members, neighbors or the vast web of the internet.

While some tips stand the test of time, others are based on myths that can actually harm plants or waste time and money. Let us take a look at a few common garden myths that l have come across during my first summer as an extension educator.

ADDING COFFEE GROUNDS HELPS ACIDIFY SOIL

Research has shown that used coffee grounds are nearly pH neutral, typically between 6.5 and 6.8, so they do not significantly acidify soil. However, all is not lost. When used in moderation, coffee grounds can be beneficial. They contain carbon, nitrogen and other compounds that feed soil organisms. Coffee grounds also make an excellent addition to compost, improving soil health over time.

USING SOAP SHAVINGS OR HUMAN HAIR TO DETER DEER

Well, this one is mixed. As Eric Barrett explains in “Gardening by the Signs & Other Garden Folklore” (2023), deer may avoid gardens after tasting soap or detecting the scent of human hair, which can trigger a natural caution response. However, by the time they encounter the soap or hair, they may have already eaten part of the garden.

Rain can also wash away both scents, reducing their effectiveness. There are also no clear guidelines on how much soap or hair to use for reliable control. While these methods can be tried, they work best when rotated frequently to prevent wildlife from adapting. For the most dependable protection, installing deer resistant fencing remains the most effective option.

USING WOOD ASH IN THE GARDEN

Wood ash can provide calcium and potassium to soil; however, they should be used with caution. A mixed vegetable garden grows best at a pH of about 6.5, which is slightly acidic. Using wood ash will raise the pH and can increase it above the ideal level for most vegetables.

Because wood ash is alkaline, adding it to soil that is already at or above this level can raise the pH too much and interfere with plant growth. Before adding any wood ash, it’s best to have your soil tested to determine your current pH and nutrient levels. This will help you decide whether wood ash is appropriate for your garden.

ORGANIC PESTICIDES ARE ALWAYS SAFER THAN SYNTHETIC PESTICIDES

Well not necessarily. Just because a pesticide is labeled organic does not mean it is always safe. Some organic pesticides can still be highly toxic to humans and to non-target organisms, including pollinators. That is why it is always important to read and follow the pesticide label carefully. Remember: the label is the law.

When in doubt, your local Extension team is here to provide research-based information you can trust.