Abstract: Two field experiments were conducted during 1998 and 1999 rainy seasons at Usmanu Danfodiyo University Sokoto Dry Land Farm, Sokoto, with a view to studying the effect of sowing date, planting distance, nitrogen and phosphorus fertilization and cultivar on growth, yield components and calyx/seed yields of roselle. The treatments consisted of three sowing dates (7th and 20th July and 3rd August in 1998; 14th and 28th July and 11th August in 1999), two cultivars (Sokoto Red and Sokoto White) and four planting distances (60x60, 60x45, 60x30 and 60x15 equivalent to 27,777, 37,037, 55,555 and 111, 111 plants ha-1, respectively). Factorial combinations of the treatment were laid out in a randomized complete block design in a split-plot arrangement, replicated three times. Analysed data showed that the cultivar Sokoto Red was superior to Sokoto white in both growth attributes as well as calyx and seed yields. The results also revealed that early sown roselle was more vigorous in growth as expressed by plant height, leaf area index and crop growth rate than latter sowings. Early sown roselle also had significantly higher (p<0.01) calyx and seed yield ha-1. Plant growth yield and their attributes were significantly influenced by plant population. Individual plants at wide intra-row spacings (60x60 and 60x45 cm) produced higher number of pods as well as calyx and seed, but on per unit land area basis, were out-yielded by those at close intra-row spacings (60x30 and 60x15 cm).