Land Preparation

Prepare a firm, weed-free seedbed to ensure a good stand. Available nitrogen levels at 120 lb N/ac. May require sulfur application at 6:1 N:S. Vegetable land often has sufficient nutrients.

Seeding Rate

Drill 5-12 lb/ac, depending on seed size. Broadcast 10-15 lb/ac. Cover 1/2 inch. After seeding, roll the ground to improve seed-to-soil contact but do not break up soil aggregates. Excess seeding rates tend to cause self-inhibition.

Seed Cost

2024 price: $2.00 to $2.50/lb

Seeding Dates

Mid-July through August. Flowers in 4-6 weeks. See a tool to see the last planting date for your location (choose “mustard”).

Time Until Control

At flowering (4-6 weeks), or winter kill

Seed Suppliers

Rupp Seeds (Caliente 199), MinnDak Growers (Tilney), McKay Seeds (IdaGold, Pacific Gold).

Management Tricks

Do not let mustards go to seed.

Unavoidable Problems

Little spring residue.

Avoidable Problems

Harbor brassica diseases: do not use in rotations with brassica vegetable crops. Can suppress cucurbit crops that follow.

Classic Uses

After late-summer harvest, eg onions.

Maintenance

None.

Control

Winter-kill followed by incorporation in the spring. Do not let mustards go to seed.

Tips

Do not use in rotations with other Brassicas. Early planting the following spring is possible because fall mustards leave little spring residue. Use for disease control after onions and lettuce on the muck. Use to suppress Verticillium in potato and to reduce weeds in the following crop. Mustards attract flea beetles and diamond-back moths, but the risk is lowest in the fall. Fall mustards are also discussed in the article on Early fall cover crops.