Growing Rosemary in Trans Nzoia

Soil suitability analysis based on Trans Nzoia's nutrient profile

Trans Nzoia County is a solid choice for Rosemary, with a soil-match score of 65/100. At an average pH of 5.93 the soil is slightly acidic to near-neutral, below Rosemary's preferred 6–8 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.68 g/kg), phosphorus (27.3 mg/kg) and potassium (213 mg/kg) all meet Rosemary's requirements, so a maintenance fertilizer programme is enough. Rosemary prefers sandy loam soils, while Trans Nzoia is largely clay loam, 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 Trans Nzoia's 65/100 suitability a realistic target here is closer to 2,031 kg/acre (~KES 304,650/acre) unless the constraints above are addressed.