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affected leaves Akadama aphid autumn balcony bark beech bonsai container bonsai cultivation box filled buds catkins colour common alder conifers controlled cut back damp sand deciduous trees develop downy birch feeding field maple filled with peat fireblight flowers frost fruit Fungal diseases fungicide fungus garden grey alder growth hard tap water height hornbeam insects juniper larch larvae late spring late summer leaf leaf-cutting leaves appear ln the wild loam granules mid-spring midsummer mildew needles Norway maple Norway spruce numbers nutrients Older branches organic bonsai fertiliser overwintered partial shade peat and sand Pests pollinated pre-shaped produce Propagation Collect seeds pruning repotted rootball rust fungus sand and peat sapling scale insect Scots pine shoots appear small-leaved lime Smooth-leaved elm soil specialist bonsai nurseries spider mites spray spruce sweet chestnut thick thickening tips trunk upright style usually wild seedling willow wind winter wire yellow Young plants