B and T World Seeds' reference number:
The average, annual, minimum temperature zone where Grevillea johnsonii is cold hardy
USDA Zone:9 20° to 30°F (-6.5° to -1°C)
|Type of plant - shrub
Flower or inflorescence:
PINK to RED - CREAM, waxy, racemes
to 1.2cm., ~globular (nick - scarify, germ. 3-16 weeks)
12-25 cm.long, pinnately divided
|Height, in meters: 4.5
Height, in feet: 14.85
|Grevillea johnsonii sales history
Common names for Grevillea johnsonii:
is included in the following
B and T World Seeds flowering plant categories.
|15||: Australian Natives and Introduced Species|
|18||: Australian and African Proteaceae|
|167||: Hedging Shrubs Ornamental Or Barrier|
|185||: Plant Species whose germination is improved by Smoke|
|"Smoke" contains a butenolide compound produced by certain plants when heated, it speeds up or starts the germination of seeds from many different genera.|
|700||: Humming Bird Nectar Plants|
Some knowledge about growing from seed is necessary to germinate even the easiest seeds.
Most seeds require humidity to germinate, even desert plants like
require that their growing medium remains moist until germination.|
Most seeds require oxygen to germinate, if buried too deep in their growing medium, or if the medium is too wet,
the seeds may not get the oxygen they require.
Grevillea johnsonii seeds will usually germinate in 20-25 days.
Soak Grevillea johnsonii seeds in warm water, which should be changed daily. Most seeds swell up when they are soaked, those that do should be sown immediately. Seeds that don't swell can be gently scarified.
(Soak for 24 hours).