Mandevilla Care Guide

Detailed Care Instructions

• Provide strong light

  Place the plant in full sun for the best bloom display. In extremely hot climates, light afternoon shade can reduce heat stress while preserving flowering.

• Water with drainage in mind

  Use a container with drainage holes and a loose, fertile potting mix. Water deeply once the upper layer dries, then allow excess water to drain completely.

• Feed during active growth

  Apply a balanced liquid fertilizer or a bloom fertilizer every 2-4 weeks from spring through summer, following the label dilution rate. Stop feeding when growth slows in fall.

• Train and prune stems

  Provide a trellis, obelisk, or support for climbing types. Pinch or prune long stems in spring and through the growing season to encourage branching and a fuller plant.

• Overwinter before frost

  Bring container plants indoors before cold weather in regions with frost. Keep them in bright light, reduce watering, and avoid cold drafts until outdoor temperatures are reliably warm.

How to Propagate

1. 1

   Take stem cuttings

   In late spring or summer, cut a healthy non-flowering stem 4-6 inches long just below a node using clean pruners.

2. 2

   Prepare the cutting

   Remove flowers and the lower leaves, leaving two or three leaves at the top. Dip the cut end in rooting hormone if available.

3. 3

   Root in a sterile mix

   Insert the cutting into moist perlite, vermiculite, or a light seed-starting mix. Keep the medium lightly moist, never saturated.

4. 4

   Maintain warmth and humidity

   Cover loosely with a clear propagation dome or bag and keep in bright indirect light at about 70-75 F (21-24 C). Vent regularly to prevent rot.

5. 5

   Pot up after rooting

   Once roots have formed and new growth appears, transplant into a well-drained potting mix and gradually introduce stronger sunlight.

Common Problems & Solutions

• 

  Yellow leaves and weak growth

  Common

  Overwatering, poor drainage, low light, or cool temperatures can cause leaves to yellow and drop.

  What to do:

  • Let the upper potting mix dry before watering again.
  • Confirm that the pot drains freely and remove standing water.
  • Move the plant to a warmer, brighter location.
• 

  Few or no flowers

  Common

  Insufficient direct sun, excessive nitrogen fertilizer, or irregular feeding can reduce flowering.

  What to do:

  • Provide at least 4-6 hours of direct sun daily.
  • Use a fertilizer formulated for flowering plants rather than a high-nitrogen feed.
  • Trim overly long stems lightly to promote branching.
• 

  Aphids, whiteflies, or spider mites

  Occasional

  Sap-feeding pests can distort new growth, leave sticky residue, or cause stippled foliage, especially on stressed plants.

  What to do:

  • Inspect leaf undersides and soft new shoots weekly.
  • Rinse pests away with a firm spray of water.
  • Treat persistent infestations with insecticidal soap or horticultural oil as directed.
• 

  Leaf spots or stem rot

  Occasional

  Fungal diseases are more likely when foliage stays wet, airflow is poor, or roots remain waterlogged.

  What to do:

  • Water the soil rather than the leaves.
  • Remove badly affected leaves and improve airflow.
  • Repot into fresh, draining mix if roots or stems are soft and dark.

Toxicity Information & Safety Guide

• Pets

  Toxic

  Chewing Mandevilla may cause mouth irritation and digestive upset in cats and dogs.

  Symptoms:

  • Drooling
  • Vomiting
  • Diarrhea
  • Mouth irritation

  What to do:

  • Keep plants out of reach.
  • Remove plant material from the mouth if safe.
  • Contact a veterinarian or pet poison service if symptoms occur.

• Children/Humans

  Caution

  The plant's milky sap and ingested tissues may cause irritation or stomach upset.

  Symptoms:

  • Burning or irritation of the mouth
  • Nausea or stomach upset
  • Skin redness after sap contact

  What to do:

  • Do not ingest plant parts.
  • Rinse the mouth or skin with water.
  • Seek medical advice for significant ingestion or persistent symptoms.

• Handling

  Caution

  Sap can irritate sensitive skin and eyes, particularly when pruning broken stems.

  Symptoms:

  • Skin itching or rash
  • Eye irritation
  • Sticky sap residue

  What to do:

  • Wear gloves when pruning.
  • Wash hands and tools after handling.
  • Rinse eyes immediately with clean water after exposure.