R. 'Cobalt'A yet unregistered new hybrid by Singing Tree Gardens is a cross between R. 'Crater Lake' x R. 'Starry Night'. The dark blue purple color of the 'Starry Night' is mixed with the larger truss size of 'Crater Lake'. The plant seems to stay much lower than 'Crater Lake' being around 3 4 ft tall in 10 years. Dark green foliage. Flowering is in late April going into early May. Hardy to zone 7. Rare Variety This variety is difficult to find anywhere due to