We are concerned about the central area of the tree field where we have planted a band of ash trees. In retrospect I wish I hadn’t planted quite so many in such a large band, but I did have my reasons. I had read that planting larger groves of the same sort of tree is better – they look better together than smaller groves or a complete mixture. Also the soil there seemed a little shallow, not really thin – just over a spade depth generally, and I’d read that ash trees have shallow roots, so thought logically that they wouldn’t mind the soil being shallower. So far so good. However, the ash hasn’t grown that quickly. Particularly below the trackway.
I think there are three reasons for this. First they don’t take exposure too well – there is quite a bit of dieback overwinter and those that are more sheltered suffer less. Secondly the area which I planted them in is just slightly well drained, and shallower on the downhill side. This is a good thing in some ways; ash trees don’t like to be sat in water. However in the spring when we get a nice dry spell, I wonder if the trees are getting slightly starved. There is competition from the particularly fine vigorous grass that likes the same well drained drier conditions. Those that we managed to mulch along the track edge have done better. The third aspect that I wonder about is that I found what appear to be vine weevil larvae all over the field, and again they like the drier conditions in this area. Maybe they are also eating the ash roots?
In the longer term I expect that we will have to replace the ash trees with something else (something that will like shallow drier soil…). In the meantime I’ve obtained some spruce and pine seedlings and have planted them to form extra windbreaks in the future. Hopefully they will give the ash trees a little more protection in the medium term, and if we do need to remove the ash due to chalera dieback, will protect whatever we replace them with as they get established. I have marked the position with hazel stick cut from new hazel trees that were a birthday present. These were rather larger than I have planted in the past, so I trimmed them back when planting so they would not suffer too much from wind rock. We will aim to mulch some of these new spruce to give them a head start against the grass, but there are so many other things needing doing…. at least we will be able to find them from the hazel twigs when we do get round to it.
Although the spruce trees are tiny, I have planted them in a double spade width hole as I did with the original plantings. It is easy to see now which way the prevailing wind is, by the direction of the grass strands across the turf. I managed to plant a couple of bands of spruce perpendicular to the wind direction two or three trees deep amongst the ash trees. The pines I mostly planted at the edges of the trackway and the very edge of the tree field where the track goes next to the southern boundary.