Only one propagates by seed. The two hybrids may pollinate the true, but the seeds won't be viable. What you will get is seed with a low germination rate but still true to type.
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There is a book 'breed your own vegetable varieties' that might be worth a look. Basically you probably can cross them and there is a reasonable chance that any cross might be 'interesting'. These techniques are used to bring traits from distantly related species into a desired crop.
Say you have a wild plant resistant to disease that you want to bring in to your domestic crop. Force a cross between them then repeatedly select and breed back those offspring to the crop plant. In a few generations you will have a new plant variety that has the genes for resistance and is similar to the domestic crop.
Is there a reason you might want to cross these comfrey plants?
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Is there a reason you might want to cross these comfrey plants?
The 2 Bocking varieties are already hybrid crossbreeds, (x uplandicum) and are sterile.
Of the 3, only the true comfrey can be propagated by seed.
Of the 21 known Bocking varieties, only two are commonly found (4 & 14) - they must have been the only two to have shown enough potential to continue with propagation programs.
I didn't know the specifics of comfrey crossing. I suspect that you could recross the hybrids back with the true comfrey (pollen from the cross) and perhaps end up with a viable seed?
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Michael Cox wrote: recross the hybrids back with the true comfrey (pollen from the cross) and perhaps end up with a viable seed?
We only have the sterile Bocking cultivars in NZ, and I've never, ever heard of them reproducing from seed.
But then I don't think I've ever met a plant as keen to grow from root cuttings
Leica - I'm not suggesting you could harvest seed from the sterile plants, but that using a bocking to pollinate a true (fertile) comfrey would give seeds on the true comfrey that should contain genetics of both the bocking and true comfrey, and may be fertile.
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Leila Rich
steward
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Location: Wellington, New Zealand. Temperate, coastal, sandy, windy,
I quite understand - I remember reading that passage of the book half a dozen times before I got my head around it. Short version - you can get the genetics out of 'sterile' plants by repeatedly crossing them with fertile relatives. It opens up options when considering plant breeding for new varieties. Your first generation cross is likely to be sterile, especially if using distant relatives, but over a number of years you can often breed back to a fertile cross with the genetics of both.
In the case of the bocking varieties - one of their most useful traits is their sterility, so they don't run rampant.
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She's brilliant. She can see what can be and is not limited to what is. And she knows this tiny ad:
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