Possible Clues:

• Squabble
• Edible leaf-stalks
• Under bush you finally dig for plant
• Plant with edible, acidic, leafstalks
• The stems are edible when cooked, the leaves are poisonous
• Purgative stalk
• Diamond disorder, e.g.
• Edible purple sticks
• Sour leafstalks usually eaten cooked and sweetened
• Spat on the field