[Griffo]

The leaves of my cauliflowers look pale and are tinged with pink/purple. I suspect they are defficient in something mineral but don't know what - any ideas/suggestions please?

[Aunt Sally]

Could be a lack of Phosphorous so give a general fertiliser.

[Griffo]

Pulled one up and  - it's root fly! Trying a handfull of wood ash around the stems of my sprouts and purple sprouting, hoping it might ward off second generation attack.