My coastal trees and shrubs were damaged by Storm Éowyn. What should I do?
I planted my garden with shrubs and trees which would tolerate salty conditions, living only a couple of hundred metres from the sea. All was well for more than 20 years, until Storm Éowyn. Now there is extensive damage, mostly on one side, to pittosporum, escallonia hedging, evergreen honeysuckle, variegated holly, choisya and viburnum. Most of the leaves have now died and fallen off. On the sheltered side the leaves appear to be undamaged. Should I cut back the damaged side or leave things be and hope there will be new growth later on in the year?
Sheila Power, Co Clare
While
Storm Éowyn
caused extensive damage to many established trees and shrubs throughout the country, this was especially the case with coastal gardens along Ireland's west and northern coastline where it hit particularly hard. As I'm sure you know, it's not just the speed and force of these kinds of violent gale force winds that can be so destructive, but also the salt they carry. Such was the exceptional force of Storm Éowyn that it carried salt very far inland, even to counties in the midlands where it could be seen as a white-grey layer on windows and plants the following day.
In your own garden where plants are especially exposed to these very salty winds, the extensive damage to the windward side of your evergreen trees and shrubs was caused by the extremely high levels of salt deposits it left on their stems and foliage. This typically burns plant tissue and ruptures plant cells, resulting in browning and discolouration of leaves, dieback of buds and stems, delayed bud break and reduced plant vigour. The resulting shock to plant health is considerable, but the good news is that most will eventually recover.
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As regards cutting back the bare stems, one of the best pieces of advice I can give you is to wait and see. Very often plants will eventually produce new growth after these kinds of extreme weather events, so long as they're given sufficient time to do so, a process of many months. In the meantime, you can check if stems and branches are still alive by using your fingernail to very gently scratch away a small section of the outer layer of the plant cambium. If you see green, this is a very good sign. If the bare stems and branches have remained pliable rather than becoming brittle and brown, this too is a good sign. You can also help your plants to make a full recovery by watering them very well, then sprinkling some slow-release pelleted organic fertiliser around the roots, followed by an organic mulch of home-made compost or well-rotted manure.
Unfortunately, the likelihood of these kinds of extreme storms becoming more frequent is much greater because of climate change, so I'd also suggest that you consider increasing the size and depth of your garden's shelterbelt planting if possible. Along with the species that you're already growing, the following will all tolerate exposed seaside growing conditions; Olearia macrodonta; Fuchsia magellanica; Hippophae rhamnoides; Phormium tenax; Pinus nigra; Pinus radiata; Acer pseudoplatanus; Alnus glutinosa; Pinus mugo; and Crataegus sp.
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