red rhubarb plant growing in compost soil, inearly spring, showing big leaves containing oxalic acid. red stalks showing.

acid angiosperms buckwheat canadian caryophyllales crown crowning cultivated dormancy early edible eudicots gardening genus growing herbaceous leaf leaves macro medicinal out oxalate oxalic perennial pink plant planted poisonous polygonaceae polygonoideae red rhabarbarum rheum rhizomes rhubarb root roots spring stalks vegetable