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Dyrkningsvejledning | Standard 

Oprettet: 06-09-2004
Revideret: 19-10-2004

Bougainvillea

   

Taxonomy

Family: Nyctaginaceae

Habitat: Brazil, Mauritius (B.glabra).

Cultivars

The principal variety among the grown Bougainvillea is B. glabra 'Alexandra'.

Propagation

Through cuttings:

Young, woody, nodal cuttings with 2-3 leaves are used. The stems of the cuttings are 2-5 mm wide and should be cut with 2-3 cms stem below the leaf. If stems are allowed longer sticking depth tends to become too deep. This leads to delayed rooting because of oxygen deficiency. 3 cuttings are stuck in 11 cm pot.

The rooting medium should be fertilized, limed sphagnum without clay and of pH approx. 6.

Substrate temperature of 22-26°C, air temperature of 20-24°C.

In the spring is the rooting period 4-5 weeks and in the summer 3-4 weeks. Rooting under elevated agryl with mist nozzles above. The summer batches should further be protected with white polythene film directly on the cuttings. The irradiation should be limited to 10.000 lux. Permanent whitewash on the glasshouses if needed.

Space demand

Propagation: 80 plants per m². Intermediary spacing 30-40 plants per m² (4-6 weeks before sale).

Climate

Temperature:

Air: 18°C

Substrate: 20-21°C

To acchieve flower initiation in the spring crop the temperature should be lowered to 12-13°C if possible.

For the summer crop the temperature by the end of October should be kept at 12°C day and night,

Substrate temperature 14°C.

Reduce light as little as possible. Only around noontime at very high light intensities.

Water

 

 

Nutrition

CO2

For 3-4 weeks after sticking no fertilizers should be applied. During vegetative growth should watering be regular without allowing the plants to dry out. Excessive watering should be avoided. In relative terms the nutrition should be: 

N : P : K : Ca : Mg

100 : 11 : 91 : 82 : 16

+ micronutrients

The nutrient solution should be 0.1%, EC 1,5-1,7.

pH 5,5-6,2. During the winterperiod should the solution be reduced to 0.05%-0.075%, Lv 1,2-1,4.

A CO2-concentration of 600-800 ppm is kept during the vegetative phase, but no enrichment should be made during flower initiation.

Regulation of growth

Pinching: Should only be carried out to stop long lateral shoots.

Growth retardants: Reducymol(ancymidol) may be applied as a 5% solution twice. 50 ml per plant for the first time when plants have been wound twice and have 1-2 cm long shoots. The second time 6 weeks later.

Alar 85(daminozid) may be sprayed on at 0.5-0.6% when the shoots are 2-3 cms.

The treatment may be repeated 2 weeks later. The bracts may fade slightly.

Flowering

Bud initiation is dependent on high light intensity, low temperature and a period of moderate water supply. If one of the parameters fail the plant will resume vegetative growth and the induction proces must be repeated.

Low nightemperature and moderate water supply must be retained for 6-8 weeks.

Short days enhance flowering.

Support

A bow (65 cms iron wire) should be placed in the pot 8-10 weeks after sticking. The shoots should be twice the length of the support and eventually be pinched. The emerged lateral shoots will mainly be located at the top of the bow. Some will be present along the sides.

The lateral shoots are 5-15 cms long and overall flowering.

Stock plants

Should be selected each year from the spring batch. The criteria are: type, colour, earliness and abundance of flowering. Half the necessary number of stock plants should be replaced every year. The stock plants should be grown in a heavier fertilized substrate than the one used for sticking. The stock plants are grown and fertilized as the normal crop. The plants are grown on the floor in the glasshouses to get sufficient height for the 1-3 m long shoots which are cut back twice a year.

Space requirement is 1 m² per plant.

550-600 cuttings per plant are produced twice a year.

Skadegørere

Aphids, Otiorrhyncus(beetles),  Botrytis, Fusarium, Pythium, Rhizoctonia, Cercosporidium (leafspot).  

Post harvest

To prevent drop of flowers during transport a spray with 0.25% Argylene (sodiumsilverthiosulphate) may be applied 1 week before sale.

Literature

Norcini, J.G., 1993: How to grow a great Bougainvilla. Grower Talks, 12: 62-68.

 

 

Kemiske midlers virkning påvirkes bl.a. af temperatur, sol, fugtighed og eventuel blanding med andre midler, samt anvendt mængde og afmålt koncentration. Da GartneriRådgivningen ikke har indflydelse på ovenstående forhold, og erfaring viser stor variation i sortsfølsomhed, ydes ikke garanti for virkning, eller påtages noget ansvar for eventuel skade på kulturplanter.
   
Sidst bekræftet: 06-10-2016 Oprettet: 06-09-2004 Revideret: 19-10-2004

Forfatter

HortiAdvice
Planteavlskonsulent

Anne Krogh Larsen

Administration


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