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Bamboo is the fastest-growing land plant in the world and is native to tropical, subtropical, and temperate climates. It grows in Australia, from north to south, even reaching the snow line. The growth rate of bamboo in Australia depends on several factors, including the type of bamboo, soil quality, weather conditions, and water availability. Some species, like the gracilis slender weaver, can double their height each year until they reach full maturity. Bamboo's growth is facilitated by access to full sun, adequate water, and proper soil preparation, with optimal conditions including neutral soil pH, sandy loam, aeration, good drainage, and high organic matter.
| Characteristics | Values |
|---|---|
| Growth rate | Fastest-growing land plant in the world |
| Growth speed | Up to 91 cm (35 inches) a day |
| Maturity | 4-8 years |
| Height | 130 feet |
| Stem thickness | 1 foot |
| Sunlight | Minimum 4 hours of filtered sunlight daily |
| Soil | pH=7 or neutral, sandy loam, aerated, good drainage, high in organic matter |
| Watering | More in summer and windy conditions |
| Fertiliser | Organic |
| Nutrients | Silica, nitrogen, potassium |
| Types | Monopodial (running or invasive), Sympodial (clumping or non-invasive) |
| Species | 500-1500 |
| Uses | Screening, hedges, timber, scaffolding, flooring, charcoal, incense sticks, furniture, medicine, food |
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What You'll Learn
Growth conditions
Bamboo is a versatile plant that grows in a variety of climates, including tropical, subtropical, and temperate regions. It is native to Asia and South America but can also be found in Australia, Africa, and the southern United States. There are approximately 1,000 species of bamboo, which can be broadly categorized into two types: clumping and running bamboo. Clumping bamboo, also known as sympodial bamboo, grows in one place and does not spread aggressively. On the other hand, running bamboo, or monopodial bamboo, spreads rapidly through underground stems called rhizomes and can become invasive.
In Australia, bamboo has faced some negative perceptions due to the introduction of many running species, which have a reputation for being invasive. However, with the growing popularity of sympodial or clumping bamboo, people are discovering the plant's versatility and benefits. The two types of bamboo have distinct growth characteristics. Running bamboo, with its long rhizomes, can rapidly expand its reach and is considered highly invasive. Clumping bamboo, on the other hand, grows in clusters and is far less invasive.
The growth of bamboo is influenced by several factors, including the type of bamboo, soil quality, sunlight, water, and climate. Bamboo prefers full sun and produces most of its foliage where there is maximum sun exposure. When planted in shaded areas or close to other plants, bamboo may grow taller but will have less foliage at the lower levels due to reduced sunlight. Therefore, it is important to ensure that your bamboo receives adequate sunlight for optimal growth.
Soil preparation is also essential for healthy bamboo growth. While bamboo is not particularly picky about soil type, it thrives in soil with a pH of 7 or neutral, sandy loam, good drainage, and high organic matter. Proper soil preparation can be achieved by using compost, manure, sawdust, chipped wood, leaf litter, or bark as mulch around the base of the plant. Additionally, removing dead culms can help your bamboo grow faster by providing more sunlight and energy to the living culms.
Watering your bamboo regularly is crucial, especially during the summer and windy periods. To water effectively, saturate the ground around the base of the plant until the water is absorbed into the soil. Applying mulch can help retain moisture and prevent water evaporation. Fertilization with organic fertilizers or compost tea can also enhance the growth of your bamboo, providing it with essential nutrients like silica, nitrogen, and potassium.
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Bamboo types in Australia
Bamboo is a versatile plant that can be used in gardens as privacy screens, hedges, or feature plants. There are two main types of bamboo: clumping and running. The running species is considered invasive and can become uncontrollable if not well contained. On the other hand, clumping bamboo is the most common controllable species, and it includes tight clumping and open clumping varieties.
Some popular types of clumping bamboo in Australia include:
- Bambusa textilis var. gracilis (Slender Weaver Bamboo): This variety is known for its tight clumping and small size, typically growing between 3-8m tall. It is often used for privacy screens or ornamental features.
- Bambusa heterostachya 'Variegata' (Variegated Malay Dwarf): A small, tight-clumping variety that adds beauty and value to any garden.
- Bambusa multiplex cv. Goldstripe: This variety is known for its compact, upright growth and striking green and gold stripes. It typically grows to a height of 3-4m and is perfect for narrow planting beds.
- Bambusa eutuldoides var. viridi vittata (China Gold): With bright lemon-yellow culms and green striations, this variety can be used for screening or ornamental purposes. It typically grows to a height of 6m.
- Buddha's Belly: This bamboo gets its name from the short swollen internodes that develop under harsh conditions. It has lemon-yellow culms with green stripes and is reasonably open-clumping.
To prevent bamboo from spreading aggressively, gardeners can use a bamboo root barrier or plant bamboo in pots.
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Preparing the soil
Choose the Right Soil
Select a quality, well-draining potting soil that is specifically designed for growing plants in pots or containers. These premium soils contain ingredients that improve water retention and sustain plant nutrients, which is essential for bamboo's healthy growth. If you are planting bamboo in the ground, ensure the soil is well-drained as bamboo does not thrive in swampy or waterlogged areas.
Enrich the Soil
To give your bamboo a nutritious boost, enrich the soil by mixing in compost or aged manure a few weeks before planting. For every three inches of native soil, mix in about three inches of compost or a 50:50 ratio of soil and compost. Mushroom compost is particularly beneficial for building up organic nutrients. Avoid using fresh or 'hot' compost, as it can heat up and damage the plant's roots.
Dig the Right Hole
When preparing to plant your bamboo, dig a hole that is twice as wide as the diameter of the pot or planter bag, and about the same depth. Since bamboo has shallow roots that grow horizontally, focus your soil improvements on the topsoil. If you are planting a bamboo hedge or screen, you can dig a trench instead. Ensure the trench is at least 40cm deep and wide enough to accommodate the bamboo's growth.
Backfill and Settle the Soil
After placing your bamboo in the hole or trench, backfill the soil around the root ball and give it a good flooding with water. This vital step helps settle the soil, removing any air pockets around the roots. If planting in an area with wet or clay soil, consider mounding up the area to avoid waterlogging.
Feed and Fertilise
To promote healthy growth, feed your bamboo with a fertiliser or plant food a month after planting and throughout the growing season. A fertiliser rich in nitrogen will keep your bamboo lush and green. Additionally, a seaweed-based plant tonic, such as Seasol, can help strengthen the plant and encourage root development.
By following these comprehensive steps for preparing the soil, you'll be well on your way to successfully growing bamboo in your garden or outdoor space.
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Watering and fertilising
Watering bamboo plants is a crucial aspect of their growth and survival. While bamboo is not a finicky plant, it is important to pay attention to its watering needs, especially in the initial stages after transplantation. Here are some detailed guidelines for watering your bamboo:
- Bamboo prefers deep watering over shallow watering. Ensure that the water reaches at least 8-12 inches deep into the soil.
- For potted bamboo, water should run out from the bottom of the pot during each watering session.
- For ground-planted bamboo, deep watering less frequently is preferable to shallow watering daily.
- The frequency of watering depends on various factors, including climate, weather conditions, soil type, and season.
- In hot and dry conditions, misting or spraying the foliage daily during the initial transition period of 2-4 weeks is beneficial.
- Keep an eye on the leaves—if they start to curl or droop, it may be a sign of dehydration or overwatering, respectively.
- During the first 2-3 months after transplantation, supplement automatic watering systems with deep hose watering every day or two.
- In cold and dry spells, watering once or twice a week is usually sufficient.
- In rainy seasons, you may go for many weeks or months without additional watering, depending on rainfall and weather conditions.
- To retain moisture and prevent water evaporation, apply a thick layer of mulch around the base of the bamboo.
- Ensure your bamboo is planted in well-drained soil to prevent root rot and other diseases caused by overwatering.
- If you observe leaf loss, it could be due to the plant adjusting to new soil and sunlight conditions. However, significant leaf loss may indicate overly wet or dry soil or a lack of sunlight.
Fertilising your bamboo is another essential aspect of its care. Here are some guidelines for fertilising:
- Bamboo benefits from fertiliser applications two to three times per year, coinciding with its two main growth seasons.
- The best time to fertilise is during the spring and summer when bamboo is in its growing stage.
- Use a high-nitrogen grass or lawn fertiliser with an NPK formulation such as 21-5-6 (Nitrogen, Phosphorus, and Potassium).
- Apply about 2 pounds of 21-5-6 fertiliser per 100 square feet of bamboo grove to provide sufficient nitrogen.
- If using organic fertilisers with lower nitrogen content, increase the application rate. For example, apply 4 pounds of a 5% nitrogen fertiliser per 100 square feet in spring and early summer.
- Compost is an excellent alternative to fertiliser, providing season-long feeding and improving soil moisture retention. Apply a 1- to 2-inch layer of compost around your bamboo plants in spring and early summer.
- Bamboo also thrives on silica, nitrogen, and potassium. Avoid using salt, as it inhibits growth.
- Repot or divide your bamboo every 5-10 years to maintain optimal health and prevent root-bound bamboo from escaping or breaking their containers.
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Sunlight and foliage
Bamboo is the fastest-growing land plant in the world. It is a member of the grass family and grows in Australia from north to south, even to the snow line. There are two types of bamboo: monopodial, or running bamboo, and sympodial, or clumping bamboo. Monopodial bamboo is the type that can quickly take over your yard and your neighbour's yard. Sympodial bamboo is recommended for gardens.
Bamboo needs sunlight for photosynthesis. Most bamboo, with a few exceptions, prefers to grow in full sun. The more sunlight your bamboo gets, the more "food" it receives, and the faster it will grow. Most bamboo species need at least four hours of filtered sunlight a day to survive. Golden bamboo flourishes with at least six hours of direct sunlight each day.
If your bamboo is planted in close proximity to other bamboo or in the shade of other trees, there will be little sun reaching the lower parts of the culms, which will cause less foliage growth at these lower levels. The bamboo will only put energy into growing foliage in places where there is good sunlight and the maximum possibility of photosynthesis. Therefore, when planted in shade, bamboo will grow taller than what it would otherwise be in full sun.
To promote more foliage at the lower levels of the bamboo, you can cut the tops off the bamboo, thus letting more light reach the bottom. Thinning out the bamboo by removing old culms will also help to let more light into the clump. However, this can be a bit of a catch-22, as you will be removing culms and thus reducing the amount of foliage. Removing the canopy foliage will allow more light to penetrate to the "heart" of the bamboo, facilitating foliage growth from the inside of the clump.
If your bamboo is getting too much direct sunlight, you may notice signs of distress such as drooping or wilting leaves. You can protect your bamboo from harsh sunlight by using shades and curtains, or by using shade cloth to diffuse the light. A north-facing window could be the sweet spot, offering consistent but gentler light. Rotate your plant occasionally to ensure even growth and prevent it from leaning into the light.
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Frequently asked questions
Bamboo is the fastest-growing plant on Earth and can grow up to 91 cm (35 inches) a day. In Australia, the gracilis slender weaver bamboo can double its height each year until it reaches full maturity.
The growth of bamboo depends on factors such as the type of bamboo, soil quality, weather conditions, and water availability. Bamboo typically prefers full sun and adequate sunlight is essential for its growth.
To water bamboo effectively, saturate the ground around the base of the plant until the water is absorbed into the soil. A thick layer of mulch can help retain moisture and prevent evaporation.
To promote faster growth, remove dead culms to increase sunlight exposure and divert energy to root growth. Using organic fertiliser or compost tea can also enhance growth, especially during the growing season in spring and summer.
There are two main types of bamboo: monopodial or running bamboo, and sympodial or clumping bamboo. Running bamboo is known for its invasive nature, while clumping bamboo is considered non-invasive and grows where it is planted.
