Growing Rosemary in Mandera

Soil suitability analysis based on Mandera's nutrient profile

Mandera County is a challenging environment for Rosemary (soil-match score 1/100) and will need significant amendment before planting. At an average pH of 8.38 the soil sits above Rosemary's preferred 6–8 range, which can limit uptake of phosphorus and micronutrients. The main gap is nitrogen — measured at N 0.53 g/kg, P 38.3 mg/kg, K 420 mg/kg against this crop's medium/medium/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy soils suit Rosemary, which favours sandy loam. Mandera receives approximately 180 mm/year — well below Rosemary's minimum of 400 mm — so supplemental irrigation would be essential for this crop. Rosemary's full potential is about 2,500 kg/acre (~KES 375,000/acre at KES 150/kg), but at Mandera's 1/100 suitability a realistic target here is closer to 31 kg/acre (~KES 4,650/acre) unless the constraints above are addressed.