On the new seedlings to get more, but shorter flower spikes, Sheila? Or are you referring to deadheading the parents to prevent seed formation?

to get more but shorter spikes

sorry thanks for your reply i want it so they bush out more

As soon as the seedlings have 6-8 true leaves, pinch out the growing tip. That should slow the growth and force it to make several main stems, instead of one or two.

tyank you very much for your answers that is just what i wanted to know