Rex Begonia Care for Flowers — How to Get Rex Begonias to Bloom

Rex begonias are grown for their spectacular foliage but they can bloom too. Learn whether to let them flower, how to encourage blooms, and when removing flowers helps the plant. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Rex begonias produce small pink or white flowers on tall stems above the foliage in late winter and spring. Many growers remove flower stems to redirect energy to the spectacular foliage which is the main attraction. Flowers are modest compared to flowering begonia species but add a delicate charm above the colorful leaves. Blooming occurs naturally when plants receive shorter day lengths in fall and winter. Allowing flowers does not harm the plant but can temporarily reduce new leaf production. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Shortening day length in fall triggers flower bud initiation — a natural photoperiod response. Well-fed mature plants with good light produce flowers most readily. The hormonal shift to flowering diverts some energy from leaf production temporarily. Indoor conditions with supplemental grow lights may prevent natural flowering by eliminating short-day signals. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Allow natural day length changes by not running grow lights past 12 hours to enable short-day flower triggering. Feed with balanced fertilizer through fall to provide energy for both foliage and flower production. Place in bright indirect light — east or north windows provide good light without excessive heat. If you prefer foliage, snap off flower stems as they appear to redirect energy to leaf growth. If you want flowers, support the delicate flower stems with thin stakes as they tend to be top-heavy. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Flowering Plants collection on Houseplants Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.