On Tue, 29 Apr 2008 21:09:12 +0100, Freedom_Spark
<Freedom_Spark.28d2f06@[EMAIL PROTECTED]
> wrote:
>
>Thanks, I closed off a small gap beside my gate & since then there
>hasn't been any damage, must have been the neighbour's cat, because all
>of our dogs are too big to have made it through.
>
>Any way, a few more questions...
>
>My radishes, lettuce, garlic, carrots etc. all seem to be doing quite
>well however, I'm slightly worried about my red onions they were
>planted as bulbs & there has been no noticable growth, what should I be
>seeing by now?
>
>Also, would there be any reason that my courgettes appear to be growing
>roots upwards :-S I hope there's no specific way seeds have to be
>planted I just randomly throw them in the tray & push them down
>slightly.
Plants can sense the Earth's gravitational field. Geotropism is the
term applied to the consequent orientation response of growing plant
parts. Roots are positively geotropic, that is, they will bend and
grow downwards, towards the center of the Earth. In contrast, shoots
are negatively geotropic, that is, they will bend and grow upwards, or
away, from the surface.
These geotropisms can be demonstrated easily with seedlings grown
entirely in darkness. A seedling with its radicle (or seedling root)
and shoot already in the expected orientation can be turned upside
down, or placed on its side, while kept in darkness. The root will
subsequently bend and grow downwards, and the shoot upwards. Because
the plant is still in darkness, phototropism (a growth movement in
response to light) can be eliminated as an explanation for these
movements. http://science.jrank.org/pages/3032/Geotropism.html
>
>Also, a sweet pepper question, do they require alot of heat to grow
>because I've had a few in trays just with propogator lids on top but no
>sign of germination as yet.
Peppers need 75° to 80°F to germinate. 10 to 30 days.
--
Susan N.
"Moral indignation is in most cases two percent moral,
48 percent indignation, and 50 percent envy."
Vittorio De Sica, Italian movie director (1901-1974)
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