Growing Rosemary in Siaya

Soil suitability analysis based on Siaya's nutrient profile

Rosemary can be grown in Siaya County, but the soil scores 52/100 and needs targeted management to reach full potential. At an average pH of 5.33 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. The main gap is potassium — measured at N 1.2 g/kg, P 12.1 mg/kg, K 134 mg/kg against this crop's medium/medium/medium demand — so the fertilizer plan below prioritises closing that deficit. Rosemary prefers sandy loam soils, while Siaya 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 Siaya's 52/100 suitability a realistic target here is closer to 1,625 kg/acre (~KES 243,750/acre) unless the constraints above are addressed.