Help-Got Foxtail Lily but should be Fall planted

Norwalk, CT(Zone 6b)

Went to Philly Flower show and bought several roots of eremurus. I thought that because the vendor was at that esteemed show, and only was selling two kinds of things, that my purchases were appropriate for planting this season. Conventional wisdom, though, when I got home and checked, is that you plant in fall. (I also learned that this vendor sells primarily through QVC and isn't too well thought of by DG'ers...!) I'm thinking I should go ahead and get them in the ground... (Maybe start a couple indoors in pots) and plant with the dahlias? The pamphlet I got says "plant immediately." Thanks for your input.
Tamar, aka confused in CT z6

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