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The Dirt: 5 Misleading Gardening Myths Busted

Lucy Mercer
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Garden Myths Busted | The Home Depot's Garden Club

This will rock your gardening world. The next time you pot up nursery transplants, skip the “drainage” step. This is the part where you place a pot shard, a bit of gravel or a rock in the pot first, for “drainage.” That’s the way my mom taught me to plant flowers, and apparently, I’m not alone, because this advice can be found on Pinterest and other social media. The problem is, it’s not necessary for healthy plants.

Adding drainage material to flowerpots is an example of a gardening myth, colloquial advice that was once shared by neighbors over the garden fence and is now spread throughout social media. We’ve all been tempted by the clickbait on Pinterest and Facebook, but it can be hard to tell gardening myths from truth.


Bulbs in Containers | The Home Depot's Garden Club

Separating gardening myth from truth is one mission of garden communicator C.L. Fornari, author of Coffee for Roses… and 70 Other Misleading Myths About Backyard Gardening (St. Lynn’s Press). “The problem with these myths is that they set people up for failure. We’re all busy and we don’t have time to do things that don’t work,” Fornari says. “My best advice is to get evidence that a method works before you pass it on.”

As for adding rocks to flowerpots, she suggests looking at nursery pots in the Garden Center. You will not find one with rocks for drainage. The damage from this unnecessary step is that roots become tangled up with rocks and shards, instead of nestling against soil that will help them get the nutrients they need. 

All that’s needed when planting containers is good quality potting soil. Just nestle the plants in, water and let the drainage hole do the work.

5 More Myths Busted


Gifts for Gardeners | The Home Depot's Garden Club

Garden Myth #1: Oak leaves and pine needles will make soil acidic.

“Decomposition is a chemical process. All organic matter, as it decomposes, becomes pH neutral,” Fornari says. The truth is, soils are acidic because of minerals in the dirt, not because of the trees growing there. So go ahead and mulch your vegetables and flowers with pine needles. The decomposing mulch will not turn the soil and harm your plants.

Garden Myth #2: When planting shrubs or trees, add a three-part mix of manure, peat moss and native soil to the planting hole first.

Over time, this “five dollar hole for a 50-cent tree” advice creates depressed plants, according to Fornari – literally! This method is no longer recommended because the peat moss and manure decompose and leave a sunken area. Additionally, all that organic matter surrounding the root ball keeps the shrub or tree’s roots from seeking new sources of food and establishing a strong root network.

When planting trees and shrubs, keep in mind the way nature works, and amend from the top down.


Tomato | The Home Depot's Garden Club

Garden Myth #3: Adding eggshells to the soil when planting tomatoes will prevent blossom end rot, the ugly black scab on the bottom of some fruit.

For years, lack of calcium was blamed for blossom end rot. Science now says that other stressors are to blame for blossom end rot. The typical culprits are uneven watering, extreme temperature swings and too much fertilizer.

Tip: To keep tomatoes evenly hydrated, lay a soaker hose by the plants and cover with a layer of mulch. Thorough, less frequent watering is better for tomatoes.

Another cracked eggshell myth: Although eggshells filled with seeds are charming on windowsills, and a fun Pinterest project for preschoolers, they aren’t ideal for healthy seedling growth. After seeds germinate and grow into seedlings, they will need to be transplanted due to lack of drainage in the eggshell. You also can’t plant the seedling in a larger garden while still in its upturned eggshell, as the eggshell interferes with root growth and takes way too long to decompose. Use peat pots or seed trays to give your plants a better start.


Knockout Rose | The Home Depot's Garden Club

Garden Myth #4: Feed banana peels, eggshells and coffee grounds directly to roses as fertilizer. 

Sure, these breakfast ingredients are organic and will decompose, but you’re better off choosing a well-balanced organic fertilizer and soil amendments. Better yet, save vegetable scraps and start a compost pile that will nourish your plants for years to come.


Soaker Hose | The Home Depot's Garden Club
Garden Myth #5: Gardens need 15 minutes of water each day to flourish.

In truth, small, frequently delivered amounts of water are not beneficial because they do not promote root growth. Fornari calls this “the irritation of the irrigation.” Just consider the variables at play: differing irrigation systems and layers of mulch and soils create a need for an individualized watering plan. The rule of thumb is 1 inch of water per week, either by irrigation or rainfall, to sustain established plants. Learn more about watering your garden.

Got questions about this article or any other garden topic? Go here now to post your gardening ideas, questions, kudos or complaints. We have gardening experts standing by to help you!