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水芹为一年或两年水生宿根、草本植物。一般株高60～70cm,最高可达80cm 以上。须根白而细,多环生于地上茎基部及匍匐茎各节上。地上部分叶柄发达,中空或实,色绿白或绿黄,基部短鞘状,包住茎部。茎叶柔软细长,为羽状复叶,小叶卵形或广卵圆形,叶缘有粗齿或分裂。伞形花序,花着生于花茎的先端,白色、形小。花期6～8月份。开花后结椭圆形果实,含种子1～2粒。水芹性喜冷凉,不耐炎热,耐寒性较强。水芹生长适宜温度为20℃,10℃以下茎叶停止生长。夏季高温水芹生长缓慢,但终年不会枯死。整个生长期需充足水分。水芹喜肥,适于土层深厚、富含有机质的黏质土壤中生长,微酸性、中性土壤最佳。此外日照时间对水芹生长发育也有较大影
Cress is a year or two of aquatic roots, herbs. General plant height of 60 ~ 70cm, up to 80cm or more. Whiskers white and thin, multi-ring was born in the ground stems stalks and stalks each section. Petiole developed above ground, hollow or solid, green and white or green and yellow, basally short sheath, covering the stem. Stems soft and slender, pinnately compound, leaflets ovate or broadly ovoid, margin with coarse teeth or split. Umbel, flowers present at apex of flower stem, white, small in shape. Flowering from June to August. Flowering knot oval fruit, with seeds 1 to 2. Cress likes cold, intolerant hot, cold tolerance stronger. The suitable temperature for the growth of cress is 20 ° C, and the growth of stems and leaves below 10 ° C stops. Summer cress slow growth, but will not die all year round. The entire growth period should be adequate moisture. Cress gratified fat, suitable for deep soil, organic matter-rich clay soil growth, slightly acidic, neutral soil best. In addition, sunshine time on the growth and development of cress also have a greater shadow