I have planted eremurus several times in the spring, no luck yet with that. Not the first sign of life. I had a beautiful white robustus I think it was, and Cleopatra, several years ago. Robustus was coming up better every year til I accidentally stuck a shovel into it just before it came up, there were 3 plants & I got the biggest 2. Maybe I damaged the 3rd one because it faded away a year later. Cleopatra hung around til about a year ago (after 6 or 7 years), not sure what happened to it. I got mine from Brent & Becky too, & tried more from them, but none have ever survived but they looked much better than any I've gotten locally. Still, if yours have sign of life, I wouldn't give up. I seem to remember they were late to come up, & since these were planted in spring, I can see them taking even longer