I have a teeny tiny pond. Each year I buy one water lettuce to float around in it. Then the lettuce starts making baby lettuce. They invariably get as big (just like baby birds) as their parents in a very short time. By the end of summer there is no water visible.
I wait patiently for the first baby lettuce so I can pinch it off and place it in one of several small water pots around the terrace. It will get as big as its parent and fill the water pot. But not this time.
In this small pot the baby made lots of babies that stayed small all summer.
Babies having babies!
My friend, the Expert Gardener, has a large pond where the water lettuce reproduce so prolifically that they shove each other out of the pond by summer's end! Mine aren't quite that pushy. Soon they'll all be dead anyway.