Let’s not beat around the bush. Grevillea robusta lifespan can be as long as 60 years. Grevillea robusta is very similar in appearance to the grevillea flower. Grevilleas are members of the plant family Proteaceae and they are native to Australia. grevilleas can grow as tall as 19 feet with atrunk width of 2 feet.
Grevilleas can live in a limited Hardiness zone range. Grevilleas are found in Australia and can grow in USDA plant hardiness zones 9b through 11, which means that it really does well in the southern states.
About Grevillea Robusta
Grevilleas prefer well-draining soils and climates with abundant sunlight, so it is important to keep grevilleas properly watered to avoid root rot.
Grevillea flowers come in a variety of colors, including greys, reds, oranges and pinks. grevillea flowers are typically tubular in shape and have long stamens that extend beyond the petals. grevilleas produce small dark-colored fruit that contains one seed.
They generally grow to be about 0.5 inches long. Grevillea seeds are typically collected from the grevillea fruit.
How to Care for the grevillea robusta
Grevillea plants are very easy to care for and can be great for a beginner. Here are some care tips which will help improve the lifespan of your plant.
Soil
Grow your plant in a well-draining soil that is on the acidic side. Grevillea plants need full or part sun, depending on the specific type of plant. Grevilleas grow best in slightly acidic soil. They are adaptable to many different soils, but their leaves may turn yellow if the soil is too alkaline. If you’re unsure what your soil pH is, have it tested before planting grevilleas.
Pruning
Prune off any dead branches throughout the year.
Common Problems
Grevilleas are generally pest-resistant, so you shouldn’t have to worry about common grevillea diseases or pests. Symptoms of common grevillea problems include yellowing leaves, flower bud dropping, possible use of pesticides if you notice ants, spider mites or scales on the plants.
Watering
Grevilleas are similar to protea. They are drought tolerant once established but will benefit from being watered during dry spells. Watering of grevilleas needs to be done with care because over-watering can kill them just as fast as under-watering. Avoid over-watering by only watering every 2 weeks during the summer months and 1 week in winter.
Light
Full sun is best for these plants, although they can tolerate part shade. If planted in too much shade, grevilleas will become leggy and spindly.
Fertilizing
You can fertilize grevilleas once or twice a year in the spring and fall to give them an extra boost of nutrients. It’s best to use a balanced fertilizer, with an NPK ratio of about 8-8-8 or 10-10-10. However, if your soil tests high in phosphorus, you should avoid fertilizing with nitrogen because this can damage the plants’ roots.
If you would like to fertilize your grevillea plant, use a balanced 20-20-20 fertilizer once every three months during the spring and summer seasons.
Grevillea Robusta Lifespan: Conclusion
Grevilleas can live for a long time with proper care and attention. Good luck taking care of this wonderful tree!