Weak-stemmed refers to a plant or stem that lacks strength and support, making it susceptible to breaking or bending easily. Synonyms for weak-stemmed include fragile, delicate, feeble, flimsy, frail, insubstantial, slender, slight, and vulnerable. The condition of being weak-stemmed can be caused by various factors such as poor nutrition, improper growth conditions, or genetic predisposition. Plants that require staking or support to grow upright may often be described as weak-stemmed. It's essential to identify weak-stemmed plants as they are more prone to damage, especially during wind or rainstorms. Regular pruning, proper fertilization, and providing adequate support are some of the methods that can help strengthen the stems of plants.