Wild mustard is the field weed turned garden volunteer — it colonises disturbed ground in early spring. The flowers are nearly identical to cultivated mustard but the plant is looser and more branching. Where it appears, it can be harvested rather than weeded.
Not typically sown deliberately; more often it arrives on its own in vegetable gardens and field edges. Mustard is Allelopathic - meaning it hinders the growth of other plants near it, so yank it out when you see it.
Aphids
Aphididae →Clusters of small soft insects on new growth and flower buds.
Knock off with a strong jet of water. Ladybirds and lacewings are natural predators. Insecticidal soap as last resort.
Flea Beetle
Alticini →Small round shot-holes scattered across leaves; tiny dark beetles that jump when disturbed. Heavy feeding stunts young plants.
Use floating row covers on seedlings. Remove crop debris and weeds that harbor beetles. Apply kaolin clay or spinosad if damage is severe.