Q.What are the soil ph requirements for Russian sage?
Planted last year, my Russian sage is not thriving. I planted it with organic compost in well drained soil. The new foliage is minimal and some plants have yellow leaves. The plants receive full sun and are near lilacs and huckleberry.
Ph 5.1 to 6.5 weakly acidic soil is ideal.
To much watering could be cause of yellowing leaves, as well as to dry, though Russian Sage usually can withstand a short drought period.
Here is a link about the care requirements.