Mandevilla Isn't Blooming

Mandevilla's bold and abundant flowers make this vine well loved by many gardeners. The reaching vines of this plant, also known as rock trumpet, are dotted with flowers during the summer and fall. It can be very disappointing if your Mandevilla is not flowering or the buds are not opening. There is always a reason when a plant does not bloom; if you figure out why, you can fix the problem. Here are some common reasons why Mandevilla isn’t blooming.


Common Reasons Why Mandevilla Isn’t Blooming

  1. Sunlight

Mandevilla needs at least 6 hours of sunlight daily. Anything less, and the plants may not bloom, but too much light can be equally problematic. Mandevilla does not like hot conditions, and intense afternoon sunlight may diminish the plant's ability to bloom.

  1. Water

Mandevilla prefers damp conditions, but this plant can survive some degree of dryness without impacting flowering. With that said, continued periods of dryness may cause Mandevilla to drop flowers or not set buds. Overwatering is also a problem, and waterlogged plants may drop blooms.

  1. Fertilizer

Rich soil and routine applications of fertilizer help Mandevilla grow and bloom. Always use a balanced fertilizer. A plant food high in nitrogen will encourage foliage growth at the expense of flowers, so always select a balanced fertilizer for Mandevilla.

  1. Pruning

You can trim Mandevilla during the growing season if the plant becomes overgrown. Removing too much growth can backfire and devoid the plant of energy for blooming. Avoid heavy pruning to ensure the plant sets plenty of flowers.  


Pruning Mandevilla To Help It Bloom

Mandevilla develops a naturally attractive form, but the plant can be trimmed if it is overgrown. Leggy plants may not be able to push out as many blooms. Trimming the plant back will encourage more growth, leading to more flowers.

Fertilizing Mandevilla To Help It Bloom

Fertilizer can support growth and help Mandevilla thrive. Use a balanced plant food to give Mandevilla a nutritional boost. Apply a slow-release fertilizer annually in the spring or a water-soluble fertilizer every few weeks during the spring and summer.

Get Mandevilla To Produce More Blooms

Help your Mandevilla produce more blooms by ensuring the plant receives ideal care. At least 6 hours of sunlight exposure per day and rich soil will support flowers. Feed the plant using a balanced fertilizer to encourage more blooms. Deadheading will not help Mandevilla bloom more, but trimming back overgrowth can help.

Why Mandevilla Isn’t Blooming

  • Mandevilla will not bloom if the plant is not receiving enough sunlight
  • Plants that are not adequately watered may drop flowers
  • Improperly watered Mandevilla may not flower
  • Over-pruning Mandevilla may prevent blooms
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Author Alison Cotsonas - Published 08-30-2022