Growing Rosemary in Kiambu

Soil suitability analysis based on Kiambu's nutrient profile

Rosemary can be grown in Kiambu County, but the soil scores 56/100 and needs targeted management to reach full potential. At an average pH of 5.28 the soil is moderately acidic, below Rosemary's preferred 6–8 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.01 g/kg), phosphorus (13.7 mg/kg) and potassium (169 mg/kg) all meet Rosemary's requirements, so a maintenance fertilizer programme is enough. Rosemary prefers sandy loam soils, while Kiambu is largely clay, so drainage and organic-matter management matter more here. Rosemary's full potential is about 2,500 kg/acre (~KES 375,000/acre at KES 150/kg), but at Kiambu's 56/100 suitability a realistic target here is closer to 1,750 kg/acre (~KES 262,500/acre) unless the constraints above are addressed.