Germination time: 15 days Time to transplanting: +28 days Time to harvesting: +173 days Mature height: 45cm (18in) Ideal pH range: 6.5 - 7.0 Sow depth: 5cm (2in) Growing plant spacing: 45cm (18in) Growing row spacing: 45cm (18in) References:  
Spearmint ( Menta spicata) is a species of mint native to much of Europe and southwest Asia.
Mint will thrive in most garden soils in most location. Keep it from overrunning the site by growing in a container or sinking metal or plastic sheets into the soil around the plant or by lifting and replanting each year.
Plant peppermint roots 5cm (2in) deep and 25cm (9in) apart in autumn or spring.
If you are not uprooting and replanting between seasons; apply a top dressing of
compost in autumn.
Harvest all summer as required by removing individual leaves.
Full troubles list: