Problems with Acers
- Japanese maples can be very prone to leaf scorch in windy or excessively sunny positions, particularly those with fine-cut leaves.
- Containerised specimens may be troubled by vine weevil larvae.
- Japanese maples are susceptible to scale insect damage.
- Acre palmatum like some other Maples is prone to the disease verticillium wilt.
- The roots of Acers in pots are vulnerable to frost over winter. Provide protection by wrapping containers with a sheet of bubble wrap held in place with garden twine.
- Do not purune particularly in spring when the rising sap can bleed from open wounds.
- Acers will not tolerate wet, excessively dry or very alkaline conditions. The plants will shed leaves, show stress and ultimately may die
Containers Grown Acers
- Japanese maples are ideal plants for growing in containers.
- Plant in an ericaceous loam-based compost which allows good drainage. Provide a high percentage of organic matter that can be found in John Innes No 2.
- Keep the compost evenly moist, but not soaking wet and feed in spring and early summer with a slow-release fertiliser. Less fertilizer is needed when the tree is planted in the ground.
- Maples will need repotting into a slightly bigger container every couple of years. April or September are ideal months to do this.
Where to Plant Your Acer
- Green-leaved Acers tolerate full sun but are best in dappled shade to avoid scorching.
- Japanese maples are slow growing and will grow best in a sheltered position.
- Red and purple leaved cultivars need some sun to develop fully their dark hues.
- Variegated Japanese maples need partial shade to prevent the afternoon sun from scorching the foliage.
- Take care when locating your containers with Acers
- Acers do not like competition for there shallow fibrous roots so ensure that they are not too crowded.
Verticillium Wilt is a wilt disease that can attack Acers see picture
Symptoms are superficially similar to Fusarium wilts. There is no chemical control for the disease.
Consider growing Acer palmatum Asahi Zuru
Read Japanese Maple root and branch review