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#1
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new large culms aborting in established Phyllostachys
Hi Group,
I would be interested in some opinions. In the UK I have a large established clump of Phyllostachys viridi-glaucescens with many 15-20ft leafed out culms. Planted in freedraining soil with the roots accessing the permanent water table of a stream at 2.5ft depth. I can see this if I dig deep enough. Normally the clump of approx 10ft x 5ft spread grows very well. This year I have had a number of large culms abort. Not small ones but the culms in the of 1.5 - 2.0 inch diameter. These are the very largest to form. They reach about 2 - 4 feet in height, then the tips start to bend and they abort. I have been feeding high nitrogen fertilizer the last few weeks at the time of culm shooting. The small culms are growing with no problems. Do the experts think this might be too much nitrogen? Do you think not enough water? Too much water from irrigation watering? They are all culms in the centre of the clump which is shaded. We have bee frost free for a number of months. Any advice would be appreciated in the hope I can stop it happening next year. With regards Alan (inUK) |
#2
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new large culms aborting in established Phyllostachys
TQPL wrote:
Hi Group, I would be interested in some opinions. In the UK I have a large established clump of Phyllostachys viridi-glaucescens with many 15-20ft leafed out culms. Planted in freedraining soil with the roots accessing the permanent water table of a stream at 2.5ft depth. I can see this if I dig deep enough. Normally the clump of approx 10ft x 5ft spread grows very well. This year I have had a number of large culms abort. Not small ones but the culms in the of 1.5 - 2.0 inch diameter. These are the very largest to form. They reach about 2 - 4 feet in height, then the tips start to bend and they abort. I have been feeding high nitrogen fertilizer the last few weeks at the time of culm shooting. The small culms are growing with no problems. Do the experts think this might be too much nitrogen? Do you think not enough water? Too much water from irrigation watering? They are all culms in the centre of the clump which is shaded. We have bee frost free for a number of months. Any advice would be appreciated in the hope I can stop it happening next year. With regards Alan (inUK) I am interested in this. My guess - and it is just a guess, is that the larger diameter culms "start" lower down - closer to the water table and it is excess water that is the cause. I claim no expertise at all. It seems to be natural for some culms to abort - but normally the first ones out seem to survive. |
#3
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new large culms aborting in established Phyllostachys
Hi Mullens,
Thanks for your input. I don't know if the larg culms have already made roots that go deeper than the rest of the clump before sprouting and so get 'drowned'. It would be difficult to asertain. Hope your bamboo plants on your stream bank are doing well. It it frustrating here, the tips at 2-5ft height seem to stall as they twist and get trapped in the culm sheaths. The terminal leaves wither and then the culm dies back from the tip. Never seen this happen before. Almost as though there is a weevil inside but cannot see any signs on examination. Driving me nuts here. Alan(inUK) "mullens" wrote in message ... I am interested in this. My guess - and it is just a guess, is that the larger diameter culms "start" lower down - closer to the water table and it is excess water that is the cause. I claim no expertise at all. It seems to be natural for some culms to abort - but normally the first ones out seem to survive. |
#4
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new large culms aborting in established Phyllostachys
"TQPL" wrote in message ...
Hi Group, I would be interested in some opinions. In the UK I have a large established clump of Phyllostachys viridi-glaucescens with many 15-20ft leafed out culms. Planted in freedraining soil with the roots accessing the permanent water table of a stream at 2.5ft depth. I can see this if I dig deep enough. Normally the clump of approx 10ft x 5ft spread grows very well. This year I have had a number of large culms abort. Not small ones but the culms in the of 1.5 - 2.0 inch diameter. These are the very largest to form. They reach about 2 - 4 feet in height, then the tips start to bend and they abort. I have been feeding high nitrogen fertilizer the last few weeks at the time of culm shooting. The small culms are growing with no problems. Do the experts think this might be too much nitrogen? Do you think not enough water? Too much water from irrigation watering? They are all culms in the centre of the clump which is shaded. We have bee frost free for a number of months. Any advice would be appreciated in the hope I can stop it happening next year. With regards Alan (inUK) Well this year 1/2 of my yellowgroove culms 2" dia aborted but we had a hard winter and there was much leaf and branch death so I think food reserves were limited. I also have a high water table here and I just keep raising things by piling on the leaves , grass clippings, woodchips and compost. |
#5
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new large culms aborting in established Phyllostachys
Hi,
Thanks for your input, it is appreciated. It perhaps is just a bad year here for the large culms in my planting spot. We had a very mild winter but it has been dry for weeks and weeks, so had to irrigate. Although I fed the clump well, I did start that late, when the shooting season had begun and perhaps there was not enough food reaching all of the clump. Fortunately adjacent other Phyllostachys nigra punctata have not suffered....that probably means little! Was interested to hear about your yellowgroove culms...great pity. Thanks Alan(inUK) "Beecrofter" wrote in message We have bee frost free for a number of months. Any advice would be appreciated in the hope I can stop it happening next year. With regards Alan (inUK) Well this year 1/2 of my yellowgroove culms 2" dia aborted but we had a hard winter and there was much leaf and branch death so I think food reserves were limited. I also have a high water table here and I just keep raising things by piling on the leaves , grass clippings, woodchips and compost. |
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