Buying your hedge plants Disease Symptoms Pathogen/Cause Management; Botryosphaeria canker: Leaves on affected branches wilt and die. For smaller hedges, such as buxus, plant approximately 25cm apart. Prevention. Spreading Cotoneasters, Cotoneaster divaricatus are erect, deciduous, rounded shrubs that grow 5-6 feet tall and up to 12 feet wide. The key to reviving a dying hedge is regular attention over a long time span. For medium-sized hedges, such as escallonia, plant about 60cm apart and for bigger hedges, such as Portugese laurel, plant at 1m. Your initial attempts to address the issues might require some hard work, particularly if you have to prune a lot of the plant, or even replace them, and making changes to the soil structure to deal with drainage will get you sweating. Root rot most commonly becomes a problem after trees have been water stressed. Where chemical control measures are necessary, we use the same pesticides as for psyllid control. If you want to learn how to prune cotoneaster, you?ve come to the right place. Looks relatively similar to Box hedging and great as a formal hedge. Hedges can be planted in a single row or a staggered double row (useful if a really dense hedge or windbreak is required). Colour will be best in full sun. They are easily maintained by careful pruning to create excellent hedge plantings. Speed of Growth: Fast. Similar symptoms occur on buxus or box, which is usually grown as a hedge or topiary, however tis is usually caused by a fungal disease generally known as Buxus Blight. Makes a great small to medium sized hedge. This hybrid native corokia, with its twisting, wiry, interlacing branches and small leaves, is excellent as a hedge and in a border. Best in full sun. Corokia x virgata ‘Silver Ghost’ Q – As a beekeeper I am keen to promote plants which provide good nectar and pollen either early or late in the season. Many scale species are heavily attacked by parasites and this may be sufficient to keep populations down to acceptable levels. The hedge is more than 10 years old, and age, combined with two very dry summers, are likely to have made it more vulnerable to pests. COLUMN: This week I continue my series on great native plants. (Corokia virgata) This form of Corokia has a nice variegated yellow leaf, meaning it is a good choice to lighten up areas or provide a bold colour for contrast. Their glossy, 1" leaves are very dark green and turn orange and red in the fall. For more info on Buxus Blight click here. Click here for tips on cutting back cotoneaster. Trim for shape and size. Another firm favourite of mine is the karaka. Branches die back and become covered with … Here is a quick guide to pests and diseases that Rhododendrons can be prone to. What plants would you suggest? Planting Distance: 30cm . 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