As you can see
by my response I DID say that on a yellow
background leaf it is possible that
crossing over yields variegation. I
am surprised that we do not see 'twin
spots' on a regular basis with
yellow hosta since somatic crossing over is
not that uncommon.
This would be
my question. If I understand the concept correctly, the greatest majority of
these events would appear in the leaves as small contained spots, and that only
a small percentage would occur in the meristem in such a position as to cause a
solid edge. From this I would deduce that we should expect to see many spots of
varying sizes in the leaves where the event had occurred outside the meristem
and failed to produce a large amount of differently colored tissue. We do not
see see the large number of spots that this theory would predict, yet we do see
many green edged gold sports. Why not?
Marcotrigiano notes this as well. I would venture to say that I've seen a lot
more hostas than he, but he is correct, these spots are rare. I have seen
parallel adjacent areas of lighter and darker tissue on gold leaves three times
that I can remember. In searching for sports I have looked closely at over a
hundred thousand plants so far, without exaggeration. None of the three
came back the following year, much less stabilized into periclinal forms. One of
the plants I saw this in was 'Amber Tiara' from Walters Gardens. Maybe CH
Falstad can comment on whether he saw one of these and what happened with it.
The other two were 'August Moon' and 'Piedmont Gold'.