Hi Jo
Sorry about your bulbs.
Here's my 2 cents worth of experience with tulips.
I grew Darwin tulips, but noticed after the third year the blooms diminished until about the fifth year, no blooms just foliage. I did a little research and realized specie tulips & tarda tulips should fit my expectations better. I wasn't dealing with insect or disease problems, sorry I cannot address that.
Since planting, my specie tulips have tripled in cluster size. The Darwins never multiplied.
I order from Brent & Becky's, also Easy To Grow Bulbs.
These are specie tulips (below)
These are Tarda (below)
