Garden Myths That Keep New Gardeners Stuck

The idea is that sharp shell edges cut soft-bodied pests, but eggshells are far less jagged than they appear up close, and they soften quickly with moisture. Studies from horticulture researchers, including work cited by the Royal Horticultural Society, found no statistically significant reduction in slug damage when eggshells were used as a barrier. Physical barriers like copper tape or purpose-made mesh have more evidence behind them.

Eggshells do contribute small amounts of calcium carbonate to soil as they decompose, but decomposition takes years in a typical garden bed — meaning any nutrient benefit is minimal in the short term.

Fresh, unbrewed coffee is acidic, but the brewing process extracts most of the acidifying compounds. Multiple extension service analyses have found used grounds to hover near a pH of 6.5–6.8 — essentially neutral. Applying large quantities can actually compact the soil surface, reducing water infiltration and air flow around roots.

If you genuinely want to lower soil pH for plants like blueberries or azaleas, elemental sulfur applied according to a soil test is the recommended approach. Grounds can still be a useful compost ingredient in moderate amounts — just don't count on them as a pH amendment.

This is one of the most counterintuitive findings in container horticulture. Water moving through soil doesn't freely cross into a coarser material below; instead, surface tension causes it to accumulate just above the gravel layer — a phenomenon called a perched water table. The result is a saturated zone directly in the root area, increasing the risk of root rot.

The most effective way to improve container drainage is to use a high-quality, well-structured potting mix and ensure the drainage hole at the bottom is unobstructed. If a pot sits on a surface that blocks outflow, elevating it slightly with pot feet helps considerably.

A study published in the journal New Phytologist did demonstrate a lens effect under specific lab conditions with smooth, waxy leaves, but the effect was negligible on most common garden foliage and required a very narrow geometry. In practice, the primary reason to avoid midday watering is water efficiency — high temperatures increase evaporation — and for some plants, wet foliage lingering overnight increases fungal disease risk.

If morning watering isn't possible, evening is fine for most plants as long as you direct water at the soil rather than drenching the foliage. The fear of burning leaves in the sun shouldn't deter you from watering when plants need it.

Natives are well-adapted to regional conditions once established, but establishment takes time. During the first year, roots are confined to the original root ball and haven't yet spread into surrounding soil. Without supplemental irrigation during dry spells, many native plants will struggle or fail in that critical period.

Low-maintenance is a long-term quality, not an immediate one. After two to three full growing seasons, many natives do become significantly more drought-tolerant and self-sufficient — but assuming zero care from day one sets new gardeners up for disappointment.

Late-season cuts encourage plants to push out tender new growth, which is highly vulnerable to frost damage. For most deciduous shrubs and trees, late winter or very early spring — just before new growth begins — is the recommended pruning window, when the plant is fully dormant but days are beginning to lengthen.

There are exceptions: summer-blooming shrubs, dead or diseased wood (which can be removed any time), and some spring bloomers that are best pruned immediately after flowering. When in doubt, consulting your local cooperative extension service for region-specific guidance is a reliable approach.