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#1
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Rose doesn't open fully
Here's a pic of a rosebush that bears abundantly, but most of the
blooms don't open fully. What causes this? I'm in Zone 8, So. Calif coastal. TIA IMG]http://i54.tinypic.com/1zeh00j.jpg[/IM HB |
#2
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Rose doesn't open fully
On 4/29/11 11:12 AM, Higgs Boson wrote:
Here's a pic of a rosebush that bears abundantly, but most of the blooms don't open fully. What causes this? I'm in Zone 8, So. Calif coastal. TIA IMG]http://i54.tinypic.com/1zeh00j.jpg[/IM HB The roses with brown petals are afflicted with a fungus, most likely mildew since you are near the coast. However, many roses never open fully. Only singles and semi-doubles open fully. True doubles generally keep opening until they fade. But they have so many layers of petals that they do not show their centers until the petals start falling. -- David E. Ross Climate: California Mediterranean Sunset Zone: 21 -- interior Santa Monica Mountains with some ocean influence (USDA 10a, very close to Sunset Zone 19) Gardening diary at http://www.rossde.com/garden/diary |
#3
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Rose doesn't open fully
On Apr 29, 12:35*pm, "David E. Ross" wrote:
On 4/29/11 11:12 AM, Higgs Boson wrote: Here's a pic of a rosebush that bears abundantly, but most of the blooms don't open fully. *What causes this? I'm in Zone 8, So. Calif coastal. TIA IMG]http://i54.tinypic.com/1zeh00j.jpg[/IM HB The roses with brown petals are afflicted with a fungus, most likely mildew since you are near the coast. However, many roses never open fully. *Only singles and semi-doubles open fully. True doubles generally keep opening until they fade. *But they have so many layers of petals that they do not show their centers until the petals start falling. That would seem counterproductive in terms of fertilization. If the insects can't get at the germ material, how can they carry it elsewhere? HB -- David E. Ross Climate: *California Mediterranean Sunset Zone: 21 -- interior Santa Monica Mountains with some ocean influence (USDA 10a, very close to Sunset Zone 19) Gardening diary at http://www.rossde.com/garden/diary |
#4
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Rose doesn't open fully
On 4/29/11 6:35 PM, Higgs Boson wrote:
On Apr 29, 12:35 pm, "David E. Ross" wrote: On 4/29/11 11:12 AM, Higgs Boson wrote: Here's a pic of a rosebush that bears abundantly, but most of the blooms don't open fully. What causes this? I'm in Zone 8, So. Calif coastal. TIA IMG]http://i54.tinypic.com/1zeh00j.jpg[/IM HB The roses with brown petals are afflicted with a fungus, most likely mildew since you are near the coast. However, many roses never open fully. Only singles and semi-doubles open fully. True doubles generally keep opening until they fade. But they have so many layers of petals that they do not show their centers until the petals start falling. That would seem counterproductive in terms of fertilization. If the insects can't get at the germ material, how can they carry it elsewhere? Most true doubles are hybrid teas. The were developed by a person cutting away all of the petals from a mature flower of one variety and then collecting the pollen. Then that person cut away all of the petals and stamens from an immature flower of another variety and then immediately tying a small paper bag over what is left of the flower. When that second flower matures, the bag is briefly removed while the pollen from the first flower is applied. Then the bag is again tied over the flower. Eventually, a rose hip (sometimes called a pip) forms with seeds inside. The stamens are removed from the second flower to prevent self-fertilization. The bag prevents stray, unknown pollen from fertilizing the flower. Notice that NO insects are involved. Also notice that a failure of a flower to open completely has no impact. Wild roses tend to have single flowers, which open completely. Heritage and species roses tend to open completely even if they have double flowers. -- David E. Ross Climate: California Mediterranean Sunset Zone: 21 -- interior Santa Monica Mountains with some ocean influence (USDA 10a, very close to Sunset Zone 19) Gardening diary at http://www.rossde.com/garden/diary |
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