I planted Salvia Gruppenblau in front of our home - Maine Zone 5 - 2 years ago. Last year it came back beautifully and filled in some areas nicely. I am noticing there is no green anywhere on any of them (7) , just the 'sticks' from last year while the rest of our perennials are coming up. Is there a chance they are all dead? I am logging everything this year, sure wish I had last year! My memory wants to say that I saw green by this time. Would appreciate any advice. Don't want to wait too long if I need to replace and also don't want to be to antsy lol
I would suggest that you ease the soil back from one of the salvias and see if the roots appear to be alive and the crown firm. Try gently scraping the base with your finger nail to see if there is green under the bark. From details on growing, your salvia is hardy to zone 7a...and considered a half-hardy plant. If I remember correctly, last year, winter was a bit milder than this past winter. Chances are they did not make it. Sorry.
I would do the test as themoon has suggested, it's a more delicate way of trying to find out if there's life in shrubs, plants and even young tree branches, just be gentle though as IF there is any growth busting out under the soil, you don't want to damage it, also have you given the new emerging plants a good watering, maybe a liquid feed but use half strength, I am only now seeing my perennial plants break into growth now and this is about 5 weeks later than usual but we have had a very prolonged winter, very wet and cold with the most snow for many years, guess what I'm saying is, there is still time for new shoots to come so be a little more patient, a couple more weeks wont hurt, but by the end if June, give up I would say.