Mulches & Soils

If you open a new bag of soil or mulch and find white mold or fungal spots, it's a direct result of moisture content. Mold and fungus thrive in moist environments containing organic matter. Since soil and mulch bags are not always perfectly waterproof, water content from the original packaging (especially in colored mulch, which retains moisture from the dyeing process) or moisture seeping in after packaging provides the ideal conditions for these harmless organisms to develop.

The mold and fungus found in soil or mulch bags are generally harmless. They are natural organisms that help break down organic matter and contribute to the health of your garden, rather than damaging your plants. They pose no risk to people or pets, though wearing gloves when gardening is always a good idea.

If you see mold on the exterior of a bag of soil or mulch, do not purchase it. This may indicate improper storage conditions and potential contamination. Unlike mold found inside the bag (which is often harmless), external mold suggests a compromised product.

Fungi, including mold and mushrooms, are essential components of a healthy soil ecosystem. These beneficial microorganisms perform a vital function: they break down organic material into readily available nutrients that your plants can easily absorb. This process is so crucial that we deliberately choose not to sterilize our growing media, ensuring we preserve these natural helpers that enrich the soil and foster balanced conditions for robust plant roots.

If you notice a large, unattractive amount of mold, it's typically a sign that the soil or mulch is too wet. While this overgrowth is not harmful to your plants, you can easily reduce or eliminate it by exposing the media to sunlight and air.

• For Unused Soil/Mulch: Spread the product out on sheets of newspaper or a tarp and allow it to dry out before application.
• For Soil/Mulch that is already applied: Allow the area in your garden to dry out a bit by reducing the frequency of your watering.

The mold should naturally dissipate once the moisture level decreases. Remember to always wear gloves when handling any growing media product.

Insects are natural to the environment and many do breed in soils and or mulches. Most of the insects that live in mulches are harmless fungus gnats. They primarily feed on the fungus found naturally in soil. Allowing the soil to dry out as much as possible between watering will help control the larvae.

If you're seeing small, dark gnats flying around, don't panic! These are likely fungus gnats. They are naturally attracted to the organic matter in potting soil and thrive when the soil stays consistently damp. The good news is they are generally harmless to you and your plants. The best way to get rid of them is to let your soil dry out completely between waterings. Fungus gnat larvae need moisture to survive, so a little "tough love" with your watering schedule usually clears them right up.

Don't worry—you aren't dealing with a pest infestation! Those small, fluid-filled yellow or green beads are actually slow-release fertilizer pellets (often called "prills"). They’re designed to soak up water and slowly "leak" nutrients into the soil over time to feed your plants. If you see white, puffy bits that look like Styrofoam, that’s perlite—a natural volcanic glass that keeps the soil airy and helps with drainage. Both are totally normal and very helpful for your plants!

Finding a few worms in your bag might be a surprise, but don't worry—it doesn't mean the soil is "bad." Since our bags are sometimes stored outdoors on the ground at garden centers or warehouses, local worms occasionally find their way inside through small ventilation holes. The good news? It’s actually a sign of a healthy environment, and the soil is perfectly safe to use for your plants.

Mulch is the key to achieving a finished, professional look in your yard. It immediately adds rich color and texture to areas like landscape beds, around trees and shrubs, or along your home's foundation. Choosing a colored mulch offers the added benefit of beautifully accenting and harmonizing with the existing colors of your home and flower gardens.

Mulches made from wood and other organic materials are valuable because they actively improve the soil as they decompose. Over time, natural soil inhabitants like microbes and insects consume the mulch. The by-products of this natural consumption are released back into the soil as organic matter, leading to healthier, more fertile growing conditions.

Mulch functions as an effective insulator, playing a critical role in regulating soil temperature throughout the year. It keeps plant roots cool during the heat of summer and provides essential warmth and protection during the winter months. This insulating property is particularly vital for tender, new plantings established in the fall, offering necessary defense as temperatures begin to drop dramatically.

Mulching directly contributes to reduced watering time because it acts as a barrier to moisture evaporation. By slowing down this process, mulch ensures that more water remains conserved in the soil, readily available to nourish thirsty plant roots.

Applying a 2 to 3-inch layer of mulch provides a natural, effective barrier against weeds. This works by blocking sunlight and physically suppressing growth, which prevents weed seeds from sprouting and taking over your landscape beds.

In most situations, there is no need to remove old mulch since it will naturally decompose and enrich your soil. The only time removal is necessary is if the layer is excessively thick (over 4 inches). If you choose to leave the old mulch, always be sure to loosen it up before adding a new layer. This simple step is vital for improving both drainage and airflow in the soil beneath.

As a general rule, applying fresh mulch to your landscape or garden beds once a year is recommended.

Arugula, leeks, lettuce, onions, radishes, spinach, strawberries, basil, chives, cilantro, dill, mint, oregano, parsley, thyme, marigolds and other annual flowers

Beans, beets, broccoli, Brussels sprouts, cabbage, cantaloupe, carrots, cauliflower, collards, cucumbers, garlic, kale, summer squash, Swiss chard, turnips, lavender, rosemary, sage, borage, calendula, cosmos, lantana, nasturtiums, snapdragons, sweet alyssum (plus everything in the 6" list)

Artichokes, asparagus, eggplant, okra, parsnips, peppers, sweet potatoes, tomatoes, watermelon, winter squash, pineapple sage (plus everything in the 6" and 12" lists)

Start feeding your plants with Miracle-Gro® Raised Bed Plant Food one month after planting, following label directions. This combination, particularly when using Miracle-Gro® Raised Bed Soil, guarantees more abundant yields (compared to unfed plants). For subsequent planting seasons, instead of replacing all the soil, simply renew it. Before planting, mix in Miracle-Gro® Refresh™ Soil Revitalizer as directed. It is designed to rebuild soil structure, enhance water retention, and replenish essential nutrients, keeping your garden beautiful and productive.