Question about nitrogen
I have three Madame Pericats that are planted near a concrete slab in my yard. I just planted them last spring, so I think they're still working to get established, but they don't look as healthy as I'd like them to - not a lot of leaves and some yellowing. I tested the soil and the PH is 6.5 and I need to add nitrogen. When should I add nitrogen? I'm afraid if I add it now, it will inhibit blooming this spring. Also, can I work to amend the soil now by adding sulfer, or should I wait till after blooming? Thanks for any help!