spring.I have a combo of daffs/snowflakes/alluim/crocus.their foliage just about ends together to be mowed over the remainder of season.
Most gladiolis will bloom 2 months after planting.can stagger the plantings also to help keep the bloom machine going.
I bought a bag of mixed lillys(all types) it was said to be 125 days of bloom.It wasn't,but I did get about 3 months.
You may want to try brett& beckys catalog.they put out a
spring& Fall one& offer different
plants in each and in the back is a chart with planting info and has a bloom time chart& will also list campanion
plants as well ( besides being a very great place to purchase from....though slow as molasses recieveing,but alot of stuff is shipped overseas as well)They just sent out their summer 2006 catalog
http://www.brentandbeckysbulbs.com/