Across

2. Aromatic bulb used as seasoning.
5. Ancient symbol of wisdom.
7. Romaine.
9. Bushy annual widely grown in China  and Japan for the flour made from  its seeds.
10. A fashion accessory on Saint David's Day.
13. Long mucilaginous green pods.
14. Any of various edible seeds of  plants of the family Leguminosae.
16. Pungent fleshy edible root,  usually eaten raw.
18. A salt tolerant member of the  goosefoot family, used as a salad  green.
19. Annual or perennial herb with  aromatic finely-cut leaves.

Down

1. Cylindrical green fruit with thin  green rind and white flesh eaten  as a vegetable; related to melons.
3. Rabbit food.
4. A plant having a large edible head  of crowded white flower buds.
5. 'Yellow turnip.'
6. Turnip, beet and mustard are types.
8. Runner is missing from the middle.
11. Mountain spinach, French spinach,  or sea purslane.
12. English, snow, sugar or chick.
15. Old name for an old vegetable  similar to rutabaga.
17. Most highly proteinaceous  vegetable crop known.