Brassica flowers have four petals in the shape of a cross, hence the old family name
Do brassicas need pollinating?
Brassica flowers are perfect but are outbreeding, so require insects for seed set. row or rows if you think there may have been crossing. Bees do not carry pollen far within a block of brassicas so the central plants are likely to be pollinated by their neighbours rather than by plants from far away.
Do all brassicas cross pollinate?
Mostly self-infertile, bee-pollinated members of the Cabbage Family (Brassicaceae) require up to a mile for distance isolation. ... For instance collards, broccoli, Brussels sprouts, cauliflower, cabbage, kohlrabi and kale (except Siberian kale) are all Brassica oleracea and will cross each other.
