pea pods

Hi This being my first year with a garden i seem to be asking for help and advice every other day ( Hope someone can help I Built a cone shaped trellis roughly 3ft at the ground to 6-7" at the top with 6ft bamboo canes and wrapped it with strong nylon netting and planted approx 15 pea plants round it. All growlng well and i have been tying to the canes as they grew. All are nearly at the top and 2 - 3 are just above Do you pinch the tops to stop them getting any higher or let the just grow ? All the plants seem very healthy and lush but no flowers or pea pods Any tips would be very welcomed Thanks Mike.