Mulch is one of those landscape elements that almost every homeowner deals with, but very few people get completely right. Done well, fresh mulch makes your beds look sharp, keeps moisture in the soil, suppresses weeds, and protects your plants through Indiana winters. Done wrong, it can suffocate plants, cause disease, invite pests, and create problems that take years to undo.
I’ve been maintaining landscape beds in Greenfield and Hancock County for over 15 years, and there are a handful of mulching mistakes I see over and over. Here’s exactly what to do — and what to avoid.
The Do’s
Do mulch to the right depth
Two to three inches is the standard. That’s deep enough to retain soil moisture, suppress weed seeds, and moderate soil temperature. Less than two inches and you lose a lot of the benefit. More than three inches and you start creating problems — particularly moisture retention right against plant stems and reduced airflow at the soil surface.
If you’re refreshing existing mulch that’s still partially intact, you usually don’t need to add a full two to three inches — just enough to bring it back up to that target depth. A lot of homeowners over-apply every year because they’re not accounting for what’s still there.
Do pull mulch away from plant stems and tree trunks
This is the most important thing I can say about mulching, and it’s the one that gets ignored most often. Mulch should never be in contact with the base of a shrub, perennial, or tree trunk. Leave a two to three inch gap.
When mulch contacts plant stems directly, it traps moisture against the tissue and creates conditions for fungal disease and rot. On trees, this is called volcano mulching — you’ve seen it, the mulch piled up like a cone around the base of a tree trunk. It looks intentional and tidy, but it’s slowly damaging the tree. I see trees in the Greenfield area with deep mulch volcanoes that have been there for years. It causes girdling roots and decay at the root flare, and the damage accumulates over time.
Pull the mulch back. Leave the root flare exposed.
Do choose the right mulch type for the application
Not all mulch is the same, and the right type depends on the application:
Shredded hardwood mulch is the most common and versatile choice for residential landscape beds in Indiana. It breaks down moderately, feeds the soil over time, and stays in place reasonably well. This is what I use for most standard bed installations and refreshes.
Wood chip mulch is coarser and breaks down more slowly. It’s a good choice for paths, natural areas, and around trees and large shrubs where you want longer-lasting coverage with less frequent refresh.
Pine bark nuggets work well in contained beds and have a clean, consistent look. They don’t break down and enrich the soil the same way shredded hardwood does, so they’re better as a decorative ground cover than a soil-building mulch.
Colored mulch (dyed black, red, or brown) is popular for aesthetic reasons. The dyes used by reputable suppliers are typically safe, but quality varies. Low-quality colored mulch is sometimes made from recycled construction lumber that may contain treated wood. Buy from a reputable supplier or let me source it.
River rock and stone mulch works well in specific situations — hot, sunny areas where organic mulch breaks down too fast, or xeriscaping applications. Stone doesn’t add organic matter to the soil, retains heat, and can make bed maintenance harder, but for the right application it’s a low-maintenance choice.
Do edge your beds before mulching
Fresh mulch on top of undefined, ragged bed edges looks sloppy. Clean edging before you mulch — either with a manual bed edger, a power edger, or a flat spade — and the mulch will look significantly better. The sharp line between lawn and bed is what makes professionally mulched beds look finished.
Do mulch in spring and touch up in fall
Spring is the primary mulching season in Greenfield. You’re refreshing beds after winter, suppressing early weed germination, and protecting soil as it warms. Fall is a good time for a light refresh if mulch has broken down through the season — it adds insulation heading into winter and protects perennial root systems through freeze-thaw cycles.
The Don’ts
Don’t pile mulch against tree trunks (volcano mulching)
Worth repeating because it’s so common. If you take one thing away from this, let it be this: keep mulch away from the trunk. The root flare — where the trunk widens at the base — should be visible, not buried. This applies to every tree in your landscape regardless of species or age.
Don’t apply fresh mulch over old mulch without checking depth
If you automatically add two inches of mulch every spring without removing or checking what’s already there, you’ll end up with four, six, or eight inches of compacted mulch over time. Thick, compacted mulch layers can become hydrophobic — they repel water instead of letting it pass through to the soil. They can also harbor fungal growth and create conditions that suffocate root systems.
Before refreshing, rake back the existing mulch, see what depth you’re working with, and only add what you need to get back to two to three inches.
Don’t mulch weeds
Mulch suppresses weed seeds — it doesn’t kill established weeds. If you mulch over actively growing weeds, they’ll push right through. Pull weeds or apply a pre-emergent before mulching. For serious weed pressure in existing beds, I often apply a pre-emergent herbicide before the mulch layer so there’s a chemical barrier working under the mulch.
Don’t use landscape fabric under organic mulch
I know landscape fabric is marketed as a weed barrier, and it does work initially. But over time, organic mulch breaks down on top of the fabric and creates a thin layer of organic matter that weed seeds are perfectly happy to germinate in. Meanwhile, the fabric prevents the organic mulch from actually improving your soil the way it’s supposed to, and it becomes a tangled, difficult-to-remove mess in a few years.
If you want a weed barrier, a two to three inch layer of properly applied organic mulch is a better long-term solution. For situations where you really need aggressive weed suppression — around trees in a commercial property, for example — a heavy cardboard underlayment (newspaper or cardboard, not plastic fabric) that biodegrades over time is a better choice.
Don’t use too much mulch around shallow-rooted plants
Hydrangeas, azaleas, and certain perennials have relatively shallow root systems. A heavy mulch layer that packs down can limit oxygen exchange at the root zone. Keep depth conservative — one and a half to two inches — around these types of plants.
Don’t skip mulching because it seems unnecessary
Some homeowners skip mulching because their beds look “okay” without it. The visible weeds, moisture loss, and bare soil between plants all accumulate in ways that create more work over time. Consistent annual mulching is one of the most preventive things you can do for a landscape bed — it suppresses weeds before they start, retains moisture so plants are more drought-tolerant, and moderates soil temperature so roots aren’t stressed by Indiana’s heat extremes in summer.
How Much Mulch Do You Need?
Here’s a quick way to estimate:
Measure the square footage of your beds (length times width). For irregularly shaped beds, break them into sections and add the totals.
One cubic yard of mulch covers about 100 square feet at a three-inch depth, or about 150 square feet at a two-inch depth.
Most residential properties in Greenfield that I work with need somewhere between three and ten cubic yards for a full refresh, depending on the size and number of beds. I’ll give you an accurate figure when I walk the property.
Professional Mulch Installation in Greenfield
I handle mulch installation as a standalone service or as part of a larger seasonal cleanup or landscaping project. When I do it, I’m edging the beds, removing existing debris, pulling surface weeds, and applying mulch at the right depth with proper clearance around all plants and trees.
If your beds haven’t been properly mulched in a while or you want to make sure it’s done right, give me a call at (317) 498-0732 or reach out through our contact page. I work with homeowners throughout Greenfield, New Palestine, McCordsville, Fortville, and the surrounding Hancock County area.