Companion Planting & Garden Value: Phacelia (Lacy Phacelia)
Phacelia tanacetifolia
Spacing: 4 per square foot. Mature height: 2.5-3.5 ft.
Pollinator & wildlife value
Johnny's Selected Seeds' own growing guide for this plant calls it out as "a major bee-forage and beneficial-insect plant, also used as a cover crop": it's an agricultural-scale insectary crop (grown in border strips specifically to draw predatory/beneficial insects into vegetable fields), not just an ornamental that happens to get visited by bees. (source)
Plant these nearby
No well-established companions.
Keep these apart
Nothing it needs to be kept away from.
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Companion planting for Phacelia (Lacy Phacelia): which plants to grow next to it, which to keep apart, and the reason behind each pairing.
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