Growing Rosemary in Kwale
Soil suitability analysis based on Kwale's nutrient profile
Generally not ideal — Kwale is poorly suited to Rosemary. Kwale's soil (pH 6.76, near-neutral) gives Rosemary a suitability score of 5/100. Match fertilizer to Kwale's nitrogen and phosphorus levels for the best result.
Kwale County is a challenging environment for Rosemary (soil-match score 5/100) and will need significant amendment before planting. Local soils average pH 6.76 — neutral and inside the 6–8 band Rosemary prefers, so no lime is usually required. The main gap is phosphorus and potassium — measured at N 0.93 g/kg, P 9.8 mg/kg, K 131 mg/kg against this crop's medium/medium/medium demand — so the fertilizer plan below prioritises closing those deficits. The county's predominantly sandy loam soils suit Rosemary, which favours sandy loam. At 200 m, the county sits below Rosemary's preferred altitude range (800–2400 m), which limits yield potential due to heat stress. On ShambaIQ's soil-match model, Rosemary is the #73 soil match of the 106 crops we assess for Kwale County. Rosemary's full potential is about 2,500 kg/acre (~KES 375,000/acre at KES 150/kg), but at Kwale's 5/100 suitability a realistic target here is closer to 156 kg/acre (~KES 23,400/acre) unless the constraints above are addressed.
Better matched to Kwale's soil: Dhania, Pigeon Peas, and Mango — each scores higher on the same soil.
Soil & climate match
| Factor | Kwale soil | Rosemary needs | Status |
|---|---|---|---|
| pH | 6.76 | 6–8 | OK |
| Nitrogen | 0.93 g/kg | min 0.8 g/kg | OK |
| Phosphorus | 9.8 mg/kg | min 12 mg/kg | Low |
| Potassium | 131 mg/kg | min 150 mg/kg | Low |
| Rainfall | 900 mm | 400–900 mm | OK |
| Altitude | 200 m | 800–2,400 m | Low |
Planting calendar for Kwale
Long Rains· April–JuneMain season here
Short Rains· November–January
Top dressing guide
Kwale's nitrogen (0.93 g/kg) already meets Rosemary's 0.8 g/kg requirement, so this is a maintenance rate.
Economics
Fertilizer prices
Green = subsidized · (Commercial) per 50kg bag