My twelve year old ponytail plant has flowered for the first time. The feathery blossoms are almost all gone. Should I cut off the long stalk that is left sprouting out of the centre, or does this produce more of the ponytail leaves to the plant? Are these little blossoms seeds of the plant? The flowery stem has almost no blossoms left now and the plant has this stalk sprouting from the middle with frail, rubbery type branches.