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Oleander

Oleander

Nerium oleander

Balcony Garden Sun ShrubMedium

For your Oleander

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Profile

Plant group
Evergreen flowering shrub
Growth & habit
A multi-stemmed, upright shrub with long, outward-arching branches; it can also be trained as a standard.
Foliage
Narrow, leathery leaves, often arranged in whorls of three; older leaves are replaced gradually.
Family
Dogbane family (Apocynaceae)
Origin
Mediterranean, North Africa, West Asia
Height
1.5–4 m (smaller in pots)
Bloom
June–September; colour and fragrance depend on the cultivar.
Toxicity
Highly toxic (all parts)

Care calendar

Leaf emergence

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Fresh growth follows increasing light and warmth; cool winter quarters delay it.

Flowering / flower development

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Main flowering is in summer; cool weather, cultivar and winter conditions affect the start.

Leaf fall

Evergreen, with no set autumn leaf fall. Some replacement is normal; investigate heavy loss.

Pruning & growth habit

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Thin only when needed after flowering, often before moving indoors. Retain healthy developing flower clusters.

Guidance for Germany and Central Europe. Position, weather, species and cultivar shift these windows; indoor and container plants also depend on their winter conditions.

Your seasonal care plan

  • Check root-ball moisture

    Jan · Feb · Mar · Apr · May · Jun · Jul · Aug · Sep · Oct · Nov · Dec

    Check container moisture before watering. Adjust to weather, foliage and position; account for lower use in winter quarters and keep drainage open.

  • Plan feeding during growth

    Apr · May · Jun · Jul · Aug · Sep

    Account for nutrients in the compost and previous feeds. For the linked fertiliser, follow the label: 10 ml per 2.5 litres of water every 1–2 weeks during growth. Pause during dormancy.

    View product dosage and application →

  • Check roots and container space

    Mar · Apr · May

    In spring, check whether the root ball needs more space. Repot into a suitable container when required, retaining the planting depth and accounting for nutrients in the fresh compost.

    View product dosage and application →

  • Overwinter in bright, frost-free conditions

    Jan · Feb · Mar · Oct · Nov · Dec

    For container plants in Germany, plan bright, cool and reliably frost-free winter quarters. Inspect leaf undersides and shoots before moving indoors; reintroduce plants to sun gradually in spring.

Highlighted months are guidance, not fixed dates. Observe the plant, root ball and weather; water, feed and repot according to actual need.

Seasonal care intensity

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Seasonal guidance for Germany. Needs depend on location, weather and species. Check moisture in winter too; these markers are not a feeding schedule.

Peak care Active Reduced care

Care tips

  • Choose a warm, sunny, sheltered spot; water regularly and ensure good drainage.
  • In Germany, grow in a container and overwinter in a bright, frost-free place.
  • Feed according to growth and need, using the dose and interval on the chosen product label.

Fruit & harvest

Fruit and seed formation

Long, narrow follicles may develop after flowering. They split when mature to release hairy seeds; fruit set is not assured in container plants.

Harvest and use

Not a food crop: all parts of oleander are highly poisonous. Treat seed pods as ornamental or propagation material and keep them away from children.

Plant knowledge at a glance

Position, benefits & character

Position & soil

Provide sun, warmth and shelter. Give container roots enough space and free drainage; overwinter in bright, cool, reliably frost-free conditions in Germany.

Distinctive features

Flower colour and fragrance depend on the cultivar. Double flowers suffer more in prolonged rain; introduce overwintered plants to sun gradually.

Benefits

Summer flowers for patios and courtyards. Grow it as an ornamental, not as a food plant; all parts are highly poisonous.

Partners & symbioses

No special symbiosis needs to be established for container care. A mycorrhizal additive is not a prerequisite for flowering or healthy growth.

Pruning & growth habit

A multi-stemmed, upright shrub with long, outward-arching branches; it can also be trained as a standard.

  1. 1. Inspect the framework

    Wear gloves. Distinguish old, bare stems from younger branches carrying developing flower clusters.

  2. 2. Remove selected old stems

    Shorten selected overlong or ageing stems low down. Leave the other shoot tips and their developing flower clusters.

  3. 3. Retain an open crown

    Avoid cutting every branch to one height. Pinching young plants encourages branching but delays flowering.

Nursery forms

This overview explains nursery supply forms. It does not indicate current availability in the GREEN24 shop.

Bare-root

Not typical for this profile

Not a suitable routine container purchase; choose rooted potted stock.

Root-balled

Ask a specialist nursery

Large specimens need a securely wrapped, well-rooted rootball.

Container-grown

Common form

The usual form; check pot size and root development.

Young plant

Common form

Small rooted plants for growing on.

Shrub

Common form

A multi-stemmed bush with flowers across the crown.

Feathered tree

Ask a specialist nursery

A stem branched from low down is not a typical oleander specification.

Half-standard

Ask a specialist nursery

A trained short standard with its crown raised above the pot.

Standard

Ask a specialist nursery

A taller trained crown; secure the stem and container against wind.

Topiary

Ask a specialist nursery

A trained crown; repeated clipping can reduce flowering.

Propagation & grafting

Propagation

Cuttings preserve the parent plant's characteristics. Seeds can be sown, but their offspring vary.

Grafting

Usually grown on its own roots from cuttings; a standard can be trained without grafting.

Species & cultivars

Sister Agnes

Vigorous, with single white flowers.

Petite Salmon

A more compact form with salmon flowers; it still needs winter protection.

Hardy Red

Single dark-red flowers. The name does not remove the need for suitable winter quarters.

Pests & diseases

These signs support an initial assessment. Different causes may look alike; choose a treatment only after identifying the problem.

Sap-feeding pests

Inspect young shoots and leaf undersides for aphids, scale or mealybugs. Check affected plants separately before overwintering.

Distorted, swollen shoots

Knobbly swellings and dark lesions can indicate oleander knot. Seek a diagnosis and keep pruning tools clean.

Few flowers

Check warmth, light and recent pruning first. Extra fertiliser cannot replace sunshine or removed flower buds.

Hardiness · USDA

Check cultivar and acclimation.

Nerium oleander
USDA 8a–10b

USDA zones describe long-term average winter extremes. Containers, young plants, wet soil, wind and late frost need separate consideration.

Understand USDA zones and maps →

A closer look

Oleander seeds with silky hairs

Oleander seeds with silky hairs

An opened Nerium oleander follicle with hairy seeds. Reduced-size, uncropped version.

Bj.schoenmakers · CC0 · Image source

Botanical features vary with age, species and cultivar.

Matching GREEN24 products

Matching fertilisers and substrates for your plant care.