AH, the merry month of May. How much we look forward to it, since it always feels like the time of greatest promise in our gardens. You can almost taste the optimism in the air. The late tulips are in full flight, herbaceous perennials are in fresh green clothes, rhododendrons and azaleas are flowering fit to bust, and there is a hint of the glorious rose to come, in the yellow flowers of climbing . But what do
