Following the phenological observations of the species of the Forest Reserve of Kalikuku in the face of seasonal variations in the climate, data on 30 taxa divided into 25 botanical families were collected. Fabaceae have more species than other families (16.6%).Defoliation (from May to August) is noticeable in 50% in Parinari holisti and Trema orientalis, in 70% in Carapa grandifolia and Ocotea usambarensis and in 100% in Bridelia micranthalj, Albizia gummifera and Piptadeniastrum africanum.Whereas, for the entire massif, flowering (November-mid-February) and its peak (December-January), fruiting (January-April), sheath dissemination (March-June), then regeneration (August-December) synchronously with the foliage influenced, at the same time, by precipitation from August to December, are the events summarized in the phenogram. As for the local use of wood, the surveys revealed 8 species involved in crafts, 12 in herbal medicine and 10 in mushroom production.