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#1
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Acer advice please
We have an Acer palmatum 'Sango-kaku' in a container. It is about 2
metres tall and is in well drained JI No. 3. The container is located in a quite sheltered place in an area that receives full sun from mid morning to early afternoon. From Spring until late Summer it looked splendid, not exhibiting any signs of problems apart from occasional very minor leaf scorch. During the last few weeks, as the leaves stated to change colour, virtually all of them have become very scorched looking and black before falling. We have not had a great deal in the way of inclement weather in recent weeks and it is still quite warm here in S Devon. Grateful for any thoughts as to probable causes. -- Robert |
#2
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Acer advice please
On 2009-10-31 19:04:14 +0000, robert said:
We have an Acer palmatum 'Sango-kaku' in a container. It is about 2 metres tall and is in well drained JI No. 3. The container is located in a quite sheltered place in an area that receives full sun from mid morning to early afternoon. From Spring until late Summer it looked splendid, not exhibiting any signs of problems apart from occasional very minor leaf scorch. During the last few weeks, as the leaves stated to change colour, virtually all of them have become very scorched looking and black before falling. We have not had a great deal in the way of inclement weather in recent weeks and it is still quite warm here in S Devon. Grateful for any thoughts as to probable causes. Winds? Watering? Drainage? -- Sacha www.hillhousenursery.com Shrubs & perennials. Tender & exotics. South Devon |
#3
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Acer advice please
Sacha wrote:
On 2009-10-31 19:04:14 +0000, robert said: We have an Acer palmatum 'Sango-kaku' in a container. It is about 2 metres tall and is in well drained JI No. 3. The container is located in a quite sheltered place in an area that receives full sun from mid morning to early afternoon. From Spring until late Summer it looked splendid, not exhibiting any signs of problems apart from occasional very minor leaf scorch. During the last few weeks, as the leaves stated to change colour, virtually all of them have become very scorched looking and black before falling. We have not had a great deal in the way of inclement weather in recent weeks and it is still quite warm here in S Devon. Grateful for any thoughts as to probable causes. Winds? Watering? Drainage? Not to mention, it's autumn. You describe a tree in an ideal situation. Except that it's in a pot. If you've managed to water regularly, there should be no problem unless the tree has fallen to verticillium wilt. This will be recognizable be black patching and streaking on the branches that starts from the extremities and works its way towards the main trunks. Otherwise, that leaves the pot. When was the last time it was root pruned and had a change of soil? Is the tree too big for the pot now, perhaps some root rot is setting in? If it's been over 3-4 years, give it a good prune. Maybe find a bigger pot if you want more size on the tree. If none of this matches, and the tree has good looking buds and no black tip dieback (or not more than normal anyway, SK is notorious), don't worry it will probably be fine in spring. Acer palmatum sometimes doesn't colour for one reason or another, maybe it's just gone dormant with no display. HTH -E |
#4
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Acer advice please
In message , Emery Davis
writes Sacha wrote: On 2009-10-31 19:04:14 +0000, robert said: We have an Acer palmatum 'Sango-kaku' in a container. It is about 2 metres tall and is in well drained JI No. 3. The container is located in a quite sheltered place in an area that receives full sun from mid morning to early afternoon. From Spring until late Summer it looked splendid, not exhibiting any signs of problems apart from occasional very minor leaf scorch. During the last few weeks, as the leaves stated to change colour, virtually all of them have become very scorched looking and black before falling. We have not had a great deal in the way of inclement weather in recent weeks and it is still quite warm here in S Devon. Grateful for any thoughts as to probable causes. Winds? Watering? Drainage? Not to mention, it's autumn. You describe a tree in an ideal situation. Except that it's in a pot. If you've managed to water regularly, there should be no problem unless the tree has fallen to verticillium wilt. This will be recognizable be black patching and streaking on the branches that starts from the extremities and works its way towards the main trunks. Otherwise, that leaves the pot. When was the last time it was root pruned and had a change of soil? Is the tree too big for the pot now, perhaps some root rot is setting in? If it's been over 3-4 years, give it a good prune. Maybe find a bigger pot if you want more size on the tree. If none of this matches, and the tree has good looking buds and no black tip dieback (or not more than normal anyway, SK is notorious), don't worry it will probably be fine in spring. Acer palmatum sometimes doesn't colour for one reason or another, maybe it's just gone dormant with no display. Emery - many thanks. No signs of black patches and streaking. We bought the tree 18 months ago and transferred it to its present container, a 17" pot, during March this year, so the root situation should be all right. There are some buds evident now but no tip dieback although many of the branches exhibited around an inch of dieback in the spring. I was concerned because the leaves were turning black rather than going through the usual gamut of changes prior to falling. With a bit of luck all will be well next year. -- Robert |
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