Acer rubrum
Red maple, Canadian maple, Scarlet maple, Swamp maple
- Height × spread
- 20m × 12m
- Position
- Full sun
- Hardiness
- Very cold to -20C (RHS H6)
- Flowers
- Spring, Autumn
Availability
Please ask in store about availability
Many plants are seasonal. Call 01234 567890 to check current stock.
About this plant
This tree is renowned for its autumn leaf colour. It makes a sturdy, striking tree with leaves that are dark green and silvered on the underside when grown on suitable soils. In autumn the leaves take on a rich red colour: part of the tree tends to colour first so that for a while, there is green against red. The species name 'rubrum' actually refers to the red flowers of the male tree. These look like tiny, red spots against the foliage.
- Flower colour
- Red
- Foliage colour
- Green
- Autumn foliage
- Red-rich
- Stem colour
- Grey
- Fruit colour
- Red
- Variegated
- No
- Scent
- No
- Shape
- Round
- Height
- 20m
- Spread
- 12m
- Height in 10 years
- 8m
- Spread in 10 years
- 4m
- Season of interest
- Spring, Autumn
- Flowers in
- Spring, Autumn
- Evergreen
- Deciduous
- Sun or shade
- Likes full sun, tolerates part shade
- Soil type
- Clay, Loam (normal)
- Soil pH
- Acid (ericaceous), Neutral
- Drainage
- Moisture retentive soil
- Hardiness
- Very cold to -20C (RHS H6)
- Borders & containers
- Borders
- Use for
- Architectural, Bee attraction
- Hazards
- No
Spring
Spring - late · Outdoors
Feed young plants with slow release fertiliser
Spread a slow release fertiliser around the base of the plant to the edge of the foliage spread, so that it can feed the roots. It is helpful for this to be applied for several years.
This is a simple way to provide a nutrient boost until the plant becomes well established.
Spring-Autumn · Outdoors
Water to keep the soil moist
For best results, this plant needs soil that is always moist. Water deeply and regularly as soon as soil appears dry. Even for established plants in the ground, a dry week can cause problems with some soils. Check plants in pots more often, especially in hot weather. Or install an automatic irrigation system which will do the hard work for you, even when you are away on holiday.
Without regular watering some plants never fully regain their beauty.
Winter
Winter · Planting
Prune to maintain the plant
Pruning is done in winter when the plant is dormant as otherwise it can 'bleed' badly when cut. Keep the plant looking attractive and healthy by removing dead branches, removing branches that cross or rub each other, and those which spoil its appearance.
The plant is encouraged to develop a pleasing shape by removing deviant or dead growth. It is much more likely to remain healthy if branches that rub, or can rub each other are removed since rubbed spots can be places where disease is introduced.
Planting & general
Outdoors
Water with rain water
This plant needs rain water or soft water (the minerals in alkaline or "hard" water are harmful). This is especially important for plants in pots.
Outdoor planting · Planting
Add root growth stimulant to the planting hole
Mycorrhizal fungi helps roots establish quickly, so they absorb water and nutrients more efficiently. It comes as a powder, granule or gel. Add to the planting hole or container, and to the plant's rootball before planting in the hole. For "bareroot" plants use a gel.
Planting
Protect & support young trees
Attach a newly planted tree or tall shrub over 1m to a tree stake to give support and prevent windrock. Use a tree guard to stop tree bark being eaten by animals, especially in areas with deer - removing bark injures a tree and in worst case can kill it.
Compost · Planting
Ericaceous compost
This plant requires acidic (ericaceous) soil. Where the soil is not acidic, or when planting in pots, use an ericaceous compost.
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