Growing Rosemary in Tharaka Nithi
Soil suitability analysis based on Tharaka Nithi's nutrient profile
Yes, with the right inputs — Tharaka Nithi is moderately suited to Rosemary. Tharaka Nithi's soil (pH 4.99, strongly acidic) gives Rosemary a suitability score of 61/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Tharaka Nithi County is a solid choice for Rosemary, with a soil-match score of 61/100. At an average pH of 4.99 the soil is strongly acidic, below Rosemary's preferred 6–8 range; agricultural lime will lift pH and unlock phosphorus the crop cannot otherwise access. Nitrogen (1.23 g/kg), phosphorus (19.6 mg/kg) and potassium (211 mg/kg) all meet Rosemary's requirements, so a maintenance fertilizer programme is enough. The county's predominantly sandy loam soils suit Rosemary, which favours sandy loam. On ShambaIQ's soil-match model, Rosemary is the #60 soil match of the 106 crops we assess for Tharaka Nithi County. Rosemary's full potential is about 2,500 kg/acre (~KES 375,000/acre at KES 150/kg), but at Tharaka Nithi's 61/100 suitability a realistic target here is closer to 1,906 kg/acre (~KES 285,900/acre) unless the constraints above are addressed.
Soil & climate match
| Factor | Tharaka Nithi soil | Rosemary needs | Status |
|---|---|---|---|
| pH | 4.99 | 6–8 | Adjust |
| Nitrogen | 1.23 g/kg | min 0.8 g/kg | OK |
| Phosphorus | 19.6 mg/kg | min 12 mg/kg | OK |
| Potassium | 211 mg/kg | min 150 mg/kg | OK |
| Rainfall | 900 mm | 400–900 mm | OK |
| Altitude | 1,100 m | 800–2,400 m | OK |
Planting calendar for Tharaka Nithi
Long Rains· March–MayMain season here
Short Rains· October–December
Top dressing guide
Tharaka Nithi's nitrogen (1.23 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