Sow outdoors, March-September on any soils to dig in the same year, or sow in August-September to overwinter and dig in the following year. Thinly broadcast the seed over finely prepared soil, which has already been watered. Dig in after 60-90 days in summer, or anytime before plants set seed and 2-3 weeks before the ground is required. Cut the plants back and allow the foliage to wilt before digging into a depth of 15-20cm (6-8"). Chop up the foliage with the spade as you dig. Overwintered crops can be dug into the soil in spring. Ensure plants are cut back or dug in before they set seed.

You can expect your phacelia tanacetifolia green manure flowers to reach around 90cm/36in tall.

Green manure phacelia can be mown before flowering to extend the cover period. Just be sure to leave plants in the ground until the soil is required for use, but do not let them set seed.