A potted mandevilla plant gives you full control over soil, drainage, and sun exposure in a way that ground planting can't match. Containers also let you move the vine indoors when cold weather hits. You get the best of both worlds with this setup. Start with the right pot, good soil, and a feeding schedule and your vine will cover its support with blooms all summer long.
I grow my mandevilla in a 14-inch terracotta pot on a south-facing deck with a bamboo trellis pushed into the soil. The vine climbs about six feet by midsummer and produces dozens of bright pink flowers. I put the trellis in at planting time to avoid damaging the roots later. This setup has worked great for me for three seasons running and the vine gets thicker each year.
Choosing the right pot size matters when you grow mandevilla in pots. Start with a container that's 2-3 inches wider than the nursery pot your plant came in. Too big of a pot holds extra moisture around the roots and leads to rot. Go with a pot that has at least two drainage holes in the bottom. You can drill more holes if your container only has one. Set the pot on risers or pot feet so water flows out and doesn't pool underneath.
Pot material affects how often you water. Terracotta breathes and dries out faster, which suits mandevilla's need for well-drained soil. Plastic holds moisture longer and works better if you tend to forget watering days. I prefer terracotta because these vines hate sitting in wet soil. The extra weight also keeps tall plants from tipping over in summer storms.
Your vine dries out much faster in a container than it would in the ground. The roots have less soil to pull moisture from and summer heat warms the pot walls on all sides. Check the top inch of soil every day during hot weather. Water when it feels dry to the touch and keep going until you see water run out the drainage holes at the bottom. This deep soak method pushes salts through the soil and keeps your roots healthy.
Good mandevilla container care means feeding your vine on a regular schedule. Use a 10-20-10 fertilizer every two weeks per Clemson Extension. The higher middle number pushes flower production over leaf growth. Skip feeding from fall through early spring when the plant rests. You can also mix slow-release granules into the top layer of soil at the start of the season. This gives your vine a steady supply of nutrients between your liquid feedings.
Fill your pot with a well-draining potting mix rather than garden soil from your yard. Garden soil packs down in containers and chokes the roots. A good mix contains peat, perlite, and bark in equal parts. You can buy a pre-made tropical plant mix at most garden centers. Repot your mandevilla when you see roots poking out of the drainage holes. This happens about every two years depending on how fast your plant grows.
Your potted vine will thrive for years if you give it sun, steady water, and regular meals. Pick a spot with at least 6 hours of direct sunlight each day. Turn the pot a quarter turn each week so all sides get even light. Prune any dead or crossing stems in early spring to keep the shape clean. These steps keep your mandevilla blooming from spring through the first frost of fall and looking its best the whole time.
Read the full article: Mandevilla Plant Care and Growing Guide
