No I have divided mine many times and they have always bloomed.

What have you fertilized them with? With tons of greenery and no flowers it sounds like too much nitrogen in your fertilizer.

When I was a newbie gardener I planted Nasturtiums and got beautiful large leaves but no flowers. That's when I found out that you don't give flowers fertilizer with too much nitrogen. Nitrogen is the first number on fertilizer. It's great for lawns but not flowers

Just a handful of bonemeal in the hole when I planted.