Sweet peas doing well. Too well?

 Sowed my sweet peas in my cool conservatory a month ago and now they are
nine inches tall and thriving.  Have I brought them on too quickly do you
think?
R.

 

I doubt it, as long as they aren't too warm.

Mine are growing in an unheated greenhouse as they became too tall for
the cold frame. I pinched them out above the second set of true leaves
over  a fortnight ago. They're about a foot tall now though no sign of
any branching, just a straight up (well, flopping over) single stem.
I'm wondering whether to pinch them back again.

How cool is cool, though? I've found in the past that keeping sweet
peas anywhere other than "cold" once they've reached the pinching
stage tends to "stretch" the plants - the distance between leaves
grows too much. They also need lots of light from all directions
rather than the one direction on a window sill.

Cheers, Jake
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Still waiting for the first frost at
the dryer (east) end of Swansea Bay.