缺氮植株生长很慢,顶端幼叶上首先褪绿整个植株也渐渐变成淡绿色到灰黄色,叶片小而薄。叶脉则由黄绿色变成深紫色,在叶背尤为明显。老叶早死,早落。茎矮而细,木质化,较坚硬,且成深紫色。根后期变成褐色,且死亡。花芽先变黄色,后凋谢。不结实,或结实极少,果小。 Nitrogen-deficient plants grow very slowly, and the first chlorotic plant on the top leaves gradually becomes pale green to greyish yellow with small and thin leaves. Veins from yellow-green into dark purple, especially in the leaves back. Old leaves premature death, early fall. Stems short and thin, lignified, harder, and dark purple. The later turns brown and dies. Flower buds first become yellow, then faded. Not strong, or very few, fruit small.