Growing Rosemary in Kirinyaga
Soil suitability analysis based on Kirinyaga's nutrient profile
Possible but challenging — Kirinyaga is only marginally suited to Rosemary. Kirinyaga's soil (pH 5.31, strongly acidic) gives Rosemary a suitability score of 50/100. Apply agricultural lime before planting to unlock phosphorus and lift the score.
Rosemary can be grown in Kirinyaga County, but the soil scores 50/100 and needs targeted management to reach full potential. At an average pH of 5.31 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. Nitrogen (1.36 g/kg), phosphorus (12.5 mg/kg) and potassium (177 mg/kg) all meet Rosemary's requirements, so a maintenance fertilizer programme is enough. Rosemary prefers sandy loam soils, while Kirinyaga is largely clay, so drainage and organic-matter management matter more here. On ShambaIQ's soil-match model, Rosemary is the #82 soil match of the 106 crops we assess for Kirinyaga County. Rosemary's full potential is about 2,500 kg/acre (~KES 375,000/acre at KES 150/kg), but at Kirinyaga's 50/100 suitability a realistic target here is closer to 1,563 kg/acre (~KES 234,450/acre) unless the constraints above are addressed.
Better matched to Kirinyaga's soil: Tea, Macadamia, and Pineapple — each scores higher on the same soil.
Soil & climate match
| Factor | Kirinyaga soil | Rosemary needs | Status |
|---|---|---|---|
| pH | 5.31 | 6–8 | Adjust |
| Nitrogen | 1.36 g/kg | min 0.8 g/kg | OK |
| Phosphorus | 12.5 mg/kg | min 12 mg/kg | OK |
| Potassium | 177 mg/kg | min 150 mg/kg | OK |
| Rainfall | 1,300 mm | 400–900 mm | High |
| Altitude | 1,500 m | 800–2,400 m | OK |
Planting calendar for Kirinyaga
Long Rains· March–MayMain season here
Short Rains· October–December
Top dressing guide
Kirinyaga's nitrogen (1.36 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