Well, since no one else is responding, I'll take a stab at it: I've always planted my alliums in the fall - around October, so I would not recommend waiting until after your dahlias die back. I've had dahlias around Thanksgiving but I don't know how long they persist in your zone. I'm guessing that you will want to dig up your dahlias for the winter. We can often get away with a heavy mulch here. You could pot up the alliums and give them time to establish roots until you remove your dahlias, then plant them out at that time. Maybe plant the bulbs fairly shallow - just a couple inches below the soil to give more room in the pot for root growth, then plant them deeper when you put them in the ground. That's what I would do if I had to lift the dahlias for the winter. Here, I would just slip the alliums in between the dahlias as gently as I could. Hope this helps!

Looking for flowering allium bulbs. All I have are Purple Sensation so I would love some more. I have the following, let me know if you're interested. Bergenia purpurea Cranesbill/geranium - looks like shepherd's warning to me Daisies - white Day Lily - Yellow stella d'oro Ferns - various Heliopsis - unnamed - close to Tuscan Sun but grows approx 4ft Hosta - various unnamed varieties (most are either solid blues or green with variegated edges) Liriope - white - divisions/runners Rose Campion Rosemary - its looking a little rough but I'm sure someone more experienced in growing rosemary could do it some go Salvia May Night Sedum Autumn Joy (unrooted cuttings) Bulbs: unnamed daffodils, tulips and muscari

Does anyone know of a source for pre-chilled ornamental allium? New home, missed fall planting, and still want a few favorites to bloom before I can get a full-scale garden design in place. Thanks!

I have Iris's for trade. I would like large globe varieties.