Trees and shrubs

Rhododendron in a pot: ideal on the terrace

The rhododendron is a beautiful shrub very suitable for container culture.

In summary, what you need to know:

Last name : Rhododendron
Family : Ericaceae
Type : Shrub

pot : 0.6 to 0.8 m
Exposure : Partial shade and shade
Substrate : Heathland

: Persistent -Flowering : March to June

  • Discover all our rhododendron cultivation advice

Our advice : choose them dwarf species for container culture, those that do not exceed 80 cm in height in adulthood.

Here are our tips for seeing the potted rhododendron grow and flower from year to year.

Planting rhododendron in a pot

Rhododendron in pots, like in soil, needs well-drained soil to avoid having its roots in contact with standing water.

Exposure of potted rhododendron:

  1. In pots, you will choose a rather shady place.
  2. Avoid too windy situations

Pot or tray for potted rhododendron:

The material of the container is irrelevant as long as the pot or bin has a bottom drainage system.

  1. Make sure the pot is well drilled
  2. The size of the pot is important, it should not be too big
  3. You will have to remember to change the pot size every 2 to 3 years (unless you are growing rhododendron in a large tank that is difficult to move)

Soil for container cultivation:

The potted rhododendron needs heathland to develop properly.

  1. Start by putting a draining layer at the bottom of the pot, made from clay balls or gravel, over a few centimeters.
  2. Fill the pot or the container with heather soil mixed with a special planting soil.
  3. Follow our advice planting heather earth plants

Caring for potted rhododendron

Size of potted rhododendron:

Again, if you have chosen a dwarf species, this work will be reduced to a maintenance pruning.

  1. Remove dead wood as you go.
  2. Cut off the inflorescence when it is wilted.
  3. To reduce branching, wait until the end of summer and cut above one eye to promote branching.

Watering rhododendron in pots:

Like most shrubs and potted plants, watering is critical because needs are different from those planted in the ground.

  • The substrate must remain slightly moist because the rhododendron fears drought
  • Water only when the surface is dry.
  • Add heather plant fertilizer regularly.

Diseases of potted rhododendron

The leaves and buds of the rhododendron turn brown:

This phenomenon is often due to the fact that the soil is poorly drained and therefore water stagnates at the roots.

  • The rhododendron should never have its feet in water and the water should drain quickly
  • If this is the case with your potted rhododendron, reduce watering slightly.

A fertilization at the end of winter with fertilizer for heather plants strengthens the rhododendron, improves flowering and prevents disease.

The leaves discolour and turn yellow:

This is usually due to excessively calcareous soil and causes what is called rhododendron chlorosis.

  • The addition of heather soil in surfacing is recommended.
  • Supplementing heather plant fertilizer should also help overcome chlorosis.

Rhododendron which withers, seems sad and stunted:

It is one of the most common diseases in rhododendron and it is often too late when you notice it.

  • It is usually caused by a fungus called phytophthora cinnamomi. It is a severe attack of the rhododendron which can cause its loss.
  • It is then necessary to treat quickly by removing and destroying the affected parts but the chances of survival are low.
  • Then treat with a systemic fungicide, the only effective solution against this fungus.

Growths form on the leaves, like blisters:

  • Although not too serious in general, this fungus called Exobasidium vaccinii is also called the leaf gall.
  • Usually, just removing the scab leaves is enough.

Smart tip

A mulch ofpine bark on the surface and over a few centimeters allows to overcome a number of problems.

  • It helps maintain humidity, add acidity and prevents the emergence of weeds.

  • Discover all our rhododendron cultivation advice

Video: How To: Pruning Rhododendrons (October 2021).