It may not be generally known that the different varieties of Spiraeas must not be pruned at the same period, and that the success in bringing their blossoms to greatest perfection will depend on the time chosen for this operation. We therefore give the following list, noting the time when to prune, compiled by Mr. Billiard, the best authority for this species of shrubs:

1. Varieties to prune in early spring: Spiraea Salcifolia Alba, Rosea, Laciniata, Billiasdii, Longiflora, Canadensis Rosea, Canadensis Alba, Douglasii Floribunda, Corymbosa, Regeliana, Semperflorens, Fortuni (Callosa), Paniculata, Alba, Folis-varieg, Excinnia, Californica, Tomentosa, Rosea Grandiflora, Pachystachys, Noblena, Gontieri, Californica Species Nova.

2. Varieties to be pruned after they are done blossoming: Spiraea Thalictroides, Sorbifolia, Picowensis, Ariaefolia, Nicondertii, Aquilegifolia, Sinensis, Expansa Nivea, Lindeyana, Opulifolia, Laevigata, Bella Rosa, Prunifolia, Prunifolia Flora Pleno, Lanceolata (Reevesii), Reevesii Flora Pleno, Reevesii Nova, Ulmifolia, Pubes-cens, Crenulata, Cana, Adiantifolia Chamaedryfolia, Blumii, Kamoon, Kamoon Spicata, Rupestris, Alpina, Oblongifolia, Amoena, Hyperioifolia, Procumbens, Grandiflora (Exocordia), Speciosa, Confusa, Thunbergii, Hookeri. - The Ruralist.