Phacelia Growing Guide

Phacelia tanacetifolia


Crop Rotation Group



Any average, well drained soil.


Full sun.

Frost tolerant

Phacelia will survive mild frosts to overwinter and bloom in spring.


None generally required.


Single Plants: 15cm (5") each way (minimum)
Rows: 15cm (5") with 15cm (5") row gap (minimum)

Sow and Plant

Sow in spring onwards as a green manure. Make sure seed is well covered, because phacelia seeds need darkness to germinate.
Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area.


Phacelia is a wonderful plant for attracting bees and other beneficial insects, particularly useful in early spring if it has overwintered as it is an early pollen source for bees coming out of hibernation.


For maximum benefit as a green manure dig in when quite small. Otherwise leave plants to grow up to 1m (3 ft) tall as the flowers attract beneficial insects.


Although native to California in the US phacelia harbours damaging lygus bugs, so it is rarely grown there.

Planting and Harvesting Calendar

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Pests which Affect Phacelia