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Does anyone know why some of the flower head on my Euphorbia charasias subsp. wulfenii unexpected die like this? They suddenly become droopy then they go brown and then the entire stem dies. This plant flowered back in the late autumn and then the winter closed in and all the stems died back. Think the weather confused it a bit!
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15 Mar, 2008
I grow a lot of these and it often happens to plants that are just getting old and woody. I then find that the whole plant withers and dies in a year or so. Very easy to replace with one of the many self sown seedlings that must be nearby.
TimB
15 Mar, 2008
I don't know Sid, but the RHS lists this plant as being Frost Hardy as opposed to Fully Hardy - have you had some cold nights this winter? I wonder if that might be a factor?
16 Mar, 2008
No, this one is all lime-green, almost sulpher yellow. I know the one you mean - maybe it is a different sub species?
On this photo
16 Mar, 2008
Thanks for the ideas, folks.
Goringfolly - it is getting quite big now, maybe it is just age. Alas, there are no seedlings. I don't know why, as this plant was a seedling that I dug up and potted on from underneath the parent plant and there were loads of them. Maybe I deadhead them a bit too enthusiastically. I tried to collect some seed last year, but they have yet to germinate. Maybe it is sterile? Do you know how I might propagate it vegitively?
Buzzbee - thanks for the thought, but I think if frost was to blame, then the effect would cover all the flower heads and not just the odd one or two. It also seems to happen over a period of time, rather than the whole lot going at once. I have a sneaking suspicion it's something fungal, but I don't know. It seems to recover each time, so I'll just wait and see i guess!
Thanks both!
Sid.
22 Mar, 2008
According to the RHS Encyclopaedia, propagation is by basal cuttings in spring or summer, by division in spring or early autumn or by seed in autumn or spring.
20 Apr, 2008
I think there is another possible cause to individual stems of woody perennials doing this 'die back' thing. I have noticed not only with Euphorbias but also Penstemons, Echinaceaes, Eryngiums and similar woody basal perennials - basal ground level stems and main root joints - the presence of slugs making a 'nest' for egg laying in late winter early spring. Because only individual spikes or stems are affected this suggests the damage is being caused 'locally'. If you can tease away the soil around the affected stem you may well find the culprit. Cut out infected material carefully and your plants should recover. Dare I also suggest a treatment with a suitable slug pellet to ensure eradication, then an application of a more environmentally friendly control - 25 to 40mm depth of coarse horticultural grit spread around the base of each plant given a radius of 250mm (10").
In Sid's garden
I grew this plant from a tiny seedling which I ...erm...'borrowed' from a garden and potted into a yogurt pot in about 2002. It has thrived and is now HUGE! Very architectural and good early spring colour, which lasts until summer. Flowers are lime green (almost sulpher yellow).
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Joined 4 Mar, 2008
North Carolina
Flcrazy
15 Mar, 2008
Does this variety have the little, bright red eye in the center of the bloom ? I would love to have one of them.
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