Planted some last year. I sure hope mine look that pretty. Did I understand you to say they INCRESE or do you just plant more because they are so pretty. ??
There may be snow in the garden, but there will always be eternal springtime in the heart of this old gardner - Saying of Old Coot
They have been increasing on their own. They form bulbils along the stems which drop and eventually become blooming size bulbs. They also set seed which germinates quite easily and becomes even more blooming stems.
They are one of my absolute FAVORITES!
Julie
"To Plant a Seed is a Noble Deed - Propagation is Conservation" Norman C. Deno, Professor Emeritus of Chemistry