A combination of my own experience and Monty's is prompting me to sow
sweet peas in a couple of weeks time, and over winter under glass (or in
my case in transparent plastic sandwich bags hung on hooks high up on a
south facing wall). Did this 2 years ago and had an excellent show.
However, the polystyrene cups used (I think this helps keep the roots
warm), were way too small (7oz) and the roots were hanging out of the
bottom by February. This time round I'm investing in some 20 oz cups. I
normally cut the bottoms off before planting out but I figure these new
cups with a 6" height might be deep enough for the whole summer root system.
Does anyone know how deep their roots go in ideal conditions. As I
recall, mine didn't go beyond that.
Any help appreciated