Maple Tree Companion Plants: 5 That Handle Dry Shade (and 3 Popular Ones to Skip)
Maple tree companion plants that survive dry shade and shallow roots: 5 groundcovers, 3 popular picks to skip, and how much soil is safe over maple roots.
Under most maples, a standard shade-garden plan fails for three reasons at once: the roots run through the top 4–15 inches of soil, the canopy sheds rain, and the shade is dense. The companions that work tolerate dry shade and fit into small pockets between roots. Below are five that do, three popular ones I would skip, and the soil-depth rules that decide whether the tree stays healthy.
Why plants struggle under a maple
Maples get to the water first. Wisconsin Horticulture Extension says the majority of a tree’s roots grow horizontally in the top 4–15 inches of soil, and the University of Missouri’s shade-gardening guide singles maples out: “Shallow rooted trees such as maples and willows are particularly troublesome” for plants competing for nutrients and moisture. Maine Extension describes a Norway maple’s roots as a dense, fibrous, shallow network that promotes dry soil and poor nutrient retention. Add a canopy that blocks rain and you get what University of Maryland Extension calls “dry shade”: maples are “notorious for being hard to garden under.”
Which maple you own changes the plan. The table below pulls what the extension sources say about each, and the takeaway is simple: sugar maple is the one to disturb least, red maple tolerates more, and silver and Norway maples give you the densest roots to work around.
| Maple | What extension sources say | What it means for planting |
|---|---|---|
| Silver maple | UF/IFAS: roots “often grow on the surface of the soil” and it is “hard to plant shrubs and other plants beneath the branches” | Small pockets only; expect roots almost everywhere |
| Norway maple | UF/IFAS: “dense shade and shallow root system competes with lawn grasses” | Plan for the driest, darkest case |
| Sugar maple | Penn State Extension lists it as sensitive to root disturbance | Dig as little as possible; use plugs |
| Red maple | Penn State lists it as tolerant of some root disturbance | More forgiving, but still hand-dig |
| Japanese maple | An Oregon Extension answer puts most feeder roots of a mature tree in the top 18 inches | Keep a couple of feet around the trunk clear |
Not sure which maple you have? Our guides to sugar maple and red maple cover planting depth and root flare for each, and Japanese maple vs red maple shows how differently the two trees fill a yard.
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Dig pockets between the roots, not beds
Hand-dig small planting pockets between roots and skip the rototiller. Wisconsin Extension says exactly that. Penn State adds the details: begin about a foot from the trunk, use a hand trowel rather than a spade, dig holes “as small as possible,” and if you hit a root two inches or more across, refill the hole and try another spot. Fine roots regrow; the thick ones hold the tree up.
The mechanism is oxygen. Roots stay shallow because that is where oxygen enters the soil, so burying them backfires. Iowa State Extension warns that four or more inches of soil “may damage or destroy” a tree by depriving some roots of oxygen. The published limits differ because they answer different questions:
| Source | Soil limit | What it applies to |
|---|---|---|
| Wisconsin Extension | About ½ inch | Covering exposed surface roots on a lawn |
| Penn State Extension | No more than 2 inches of soil or compost; none within 1 foot of the trunk | Building a planting area under a tree |
| Iowa State Extension | 1–2 inches gives only temporary relief; 4+ inches may damage the tree | Burying roots to hide them |
My reading, not an official figure: treat ½ inch as the ceiling for covering roots and 2 inches as the ceiling for any planting area, with nothing added near the trunk. The same logic explains why the Missouri guide says not to “haul in several inches of compost-rich amendment to till into soil under shade trees.” Tillage damages roots, and the guide’s alternative is to apply compost in small pockets or core-aeration holes.
Start small. Maryland Extension advises that small plants “should establish with as few challenges as possible,” with periodic irrigation while they settle, and Penn State recommends deep weekly watering for the first one to two years. Finish with a flat mulch layer: Iowa State says wood chip or shredded bark in a 2–4 inch layer is beneficial to trees, Maryland caps it at 3 inches, and Penn State suggests 1–2 inches right after planting. Where those differ, 2 inches is the one depth that sits inside all three ranges. Our mulching guide covers materials.
Five maple companion plants that handle dry shade
These five each have a published claim of dry-shade or drought tolerance. One caveat up front: I found no extension trial that tests them under maples specifically, so the match is dry-shade tolerance, not a maple-root guarantee. All of them need regular water until established.
| Plant | Size and hardiness | Dry-shade evidence | The catch |
|---|---|---|---|
| Bigroot geranium (Geranium macrorrhizum) | About 8 in tall, spreads 20–40 in; RHS H7 (hardy below −20°C) | RHS: “one of the few plants that can tolerate dry shade”; NYBG credits thick rhizomes | Cultivars range from 8 to 18 inches; self-seeds |
| Bicolor barrenwort (Epimedium × versicolor ‘Sulphureum’) | Up to 1 ft tall, 1–1.5 ft wide; zones 5–9 | NC State: “drought tolerant once established”; Illinois Extension also files epimedium under dry shade | Spreads by rhizomes, faster than other epimediums |
| Pennsylvania sedge (Carex pensylvanica) | 1–8 in tall; zones 3–8 | NC State: “an ideal turf alternative in dry shade areas” | Will not take heavy foot traffic; mow once or twice a season |
| Spotted deadnettle (Lamium maculatum) | 3–9 in tall, 2 ft wide; zones 3–8 | NC State: “will tolerate dry soil”; Illinois Extension lists it for dry shade once established | Leaves scorch if soil dries out; spreads indefinitely |
| Japanese pachysandra (Pachysandra terminalis) | 6–12 in tall, 12–18 in wide; zones 4–9 | NC State: “can tolerate drought conditions” | “Can spread aggressively and is difficult to remove”; thin it for airflow |
The takeaway in one sentence: bigroot geranium and Pennsylvania sedge have the strongest dry-shade wording, while pachysandra and deadnettle are the spreaders, so give them an edge you can maintain. For a first pocket, I would start with the geranium or the sedge. For more options by region, see our list of plants for dry shade and the wider best plants for shade guide.
Two companions that need a workaround
Hostas work if the soil holds water. The experts disagree. Maine Extension says hostas under a Norway maple “have no trouble with shade and are pretty tolerant of poor, dry soil.” NC State describes them in “moist, slightly acidic soils that are rich in organic matter” and says nothing on drought. My reading: they survive a maple’s edge, where roots thin out, but a pocket in the root mass needs a hose. Deer, rabbits and slugs are a separate problem.
Spring bulbs sidestep the problem with timing. The RHS notes that scillas grow well under deciduous trees, “where they enjoy early-year sun before the canopy closes over,” in moist but well-drained soil. The logic is that they do their growing before the canopy closes, not under it. Penn State’s underplanting list adds spring ephemerals such as Virginia bluebells, wood anemone and trillium, and recommends small plugs, spring seedlings or small divisions because they have smaller root masses to fit between roots.
Three popular picks I would skip (or irrigate)
These appear on mainstream shade lists. The problem is not shade; it is dry soil or spread.
- Wild ginger. NC State says Canadian wild ginger has “poor drought tolerance” and performs best in soil that “maintains constant moisture,” and Illinois Extension puts it in the wet-shade group. Iowa State still lists it as a shade groundcover, so check which soil you have.
- Astilbe. Maine Extension says astilbe is “less tolerant of the attendant poor soil conditions under the tree” and the expert would “hesitate to invest any significant amount of money” in it. That is one expert’s judgement, not a trial.
- Lily of the valley. Iowa State says it spreads rapidly, often becomes invasive, and “should not be planted with other perennials as they quickly crowd out neighboring plants.”
After planting: the first two years
New plants under a maple are in a water contest they cannot win without help, so the first two years decide the outcome.
- Water deeply once a week. Penn State recommends this for the first one to two years “to encourage deep rooting,” and Maryland Extension notes small plants may need periodic irrigation while they settle.
- Manage the leaf fall. Missouri Extension warns that fallen leaves “can mat down and smother shade garden plants,” but shredded leaves can safely be applied as mulch. Penn State suggests raking only where leaves smother plants.
- Refresh mulch each spring. Penn State also suggests a slow-release organic fertilizer and a good watering at that point.
- Expect roots to return. Wisconsin Extension notes that roots covered with a thin layer of soil may resurface after a few years, and the fix is another thin layer, not a thick one.
Planting under a Japanese maple
The same rules apply with tighter margins. The Oregon Extension answer advises placing shrubs at least two times their expected mature width away from the trees and each other, with groundcovers allowed closer and a couple of feet kept clear around each trunk. For Japanese maples specifically, see our guides to leaf scorch and growing them in containers.
Frequently asked questions
Can you plant under a maple tree?
Yes, in small hand-dug pockets between roots, starting about a foot from the trunk. Skip the rototiller and avoid cutting any root two inches or thicker.
What will grow under a maple where grass won’t?
Turf fails because of shade and root competition, so Maryland Extension recommends mulch or groundcovers. Bigroot geranium, Pennsylvania sedge, barrenwort, deadnettle and pachysandra all have dry-shade claims.
How deep can you dig under a maple?
Most of a tree’s roots sit in the top 4–15 inches, so keep each hole as small as the plant’s root ball allows and refill it if you hit a thick root.
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→ View My Garden CalendarShould you add topsoil or compost under a maple?
Only a little. Sources cap it at about ½ inch over exposed roots and 2 inches in a planting area, and Iowa State warns that 4 or more inches may damage the tree. If the maple itself looks stressed, check how often to water a new maple and whether it needs fertilizer first.
Companion plants depend on the maple’s mature size and shade; compare all 15 types of maple trees first.
Sources
- Alfuth, D. How to Deal with Surface Tree Roots. UW-Madison Division of Extension, Wisconsin Horticulture.
- Iowa State University Extension and Outreach. Can I cover large surface roots around my shade tree?
- Ford, E. Underplanting trees: respect the roots. Penn State Extension (updated June 2025).
- Starbuck, C. J. Gardening in the Shade (MU Guide G6911). University of Missouri Extension.
- Foster, J. Will astilbe thrive under my Norway Maple at the outer edges where I can dig? University of Maine Cooperative Extension (August 2022).
- University of Maryland Extension, Home and Garden Information Center. Ask Extension question 914050 (August 2025).
- Ask Extension, Benton County, Oregon. Planting under trees, question 891018 (December 2024).
- Gilman, E. F., et al. Acer saccharinum: Silver Maple (ENH-207). UF/IFAS Extension (revised December 2018).
- Gilman, E. F. and Watson, D. G. Acer platanoides: Norway Maple (ENH-187). UF/IFAS Extension.
- Royal Horticultural Society. Geranium macrorrhizum ‘Czakor’ plant profile.
- New York Botanical Garden, Mertz Library. Can you recommend a ground cover for my part-sun, part-shade perennial beds? (updated March 2025).
- NC State Extension. Epimedium × versicolor ‘Sulphureum’, Carex pensylvanica, Lamium maculatum, Pachysandra terminalis, Asarum canadense and Hosta, Plant Toolbox entries.
- Illinois Extension. Should you grow grass under trees? Flowers, Fruits, and Frass (March 2016).
- Iowa State University Extension and Outreach. What are some good groundcovers for shade?
- Royal Horticultural Society. Scilla plant guide.
