Growing Pyrethrum in Laikipia

Soil suitability analysis based on Laikipia's nutrient profile

Laikipia County is a challenging environment for Pyrethrum (soil-match score 32/100) and will need significant amendment before planting. At an average pH of 4.99 the soil is strongly acidic, below Pyrethrum's preferred 5–6.5 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. The main gap is phosphorus — measured at N 1.42 g/kg, P 16.6 mg/kg, K 215 mg/kg against this crop's medium/high/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy loam soils suit Pyrethrum, which favours loam. Laikipia receives approximately 600 mm/year — well below Pyrethrum's minimum of 900 mm — so supplemental irrigation would be essential for this crop. Pyrethrum's full potential is about 500 kg/acre (~KES 140,000/acre at KES 280/kg), but at Laikipia's 32/100 suitability a realistic target here is closer to 200 kg/acre (~KES 56,000/acre) unless the constraints above are addressed.