Australian Tree Fern

Cyathea cooperi Brentwood

Australian Tree

Our Australian Tree Fern, ‘Brentwood’, is a selected clone of the species Cyathea cooperi. Its growth is much faster than other tree ferns and can grow to be 15 feet tall in 10 years in the right growing conditions. Along the lower California coast, for example, you may see 30 foot specimen trees with fronds 6 to 8 feet long.

The trunk of this tree fern is formed from its roots, and so it’s advisable to water its trunk, as well as the soil.

It may be used as an annual for special effect in the garden in cold winter areas, but leave them in their containers and bring them in before freezes occur. It is normally grown in 5 gallon, 15 gallon and larger containers for the landscape trade. This tree fern is safe to use in landscaping where the winter temperatures do not fall below 26° F.

For Growers[+]

One of our best sellers, Australian Tree Fern is very easy to grow. It takes approximately 12 to 14 weeks to finish a 4 inch pots from a 72 cell. Most of tropical ferns can tolerate higher light level than perennial fern. It still needs protection though! Australian tree fern requires a minimum of 9 hours of light per day ranging from 1500 to 3000 ftc. The quality of the light is another important factor that affects healthy plant growth. For light protection, white poly is preferred over clear poly as it distributes light more evenly. With adequate ventilation, most tropicals are happy with 50% to 60% shade. One good way to test your light level is to put your hand above the plants during the mid of the day. If you can hardly see your hand’s shadow your light level is adequate. If not, you may want to increase or decrease your shade.

Australian tree Fern reaches its maximum growth rate at soil temperatures between 70°F and 80°F. Temperatures outside this range will slow growth. Australian Tree fern stops growing once the soil temperature drops to 62° F.

Never Let This Plant Dry Out! Australian Tree Fern likes moist and well-drained soil. Keep the soil consistently moist, but not soaking wet. Ebb and Flood or drip irrigation are ideal as they help keep the foliage dry, thus reducing foliar diseases. In outdoor and shade house settings, water overhead early in the day or use drip irrigation so that the foliage has a chance to dry out before night fall.

When well cared for, ferns have very few diseases and pests. Caterpillars, fungus gnats, aphids and scale can become a problem. However, they are easily treated with your state’s recommended pesticides. Do not use copper-based products on ferns.

To supply all nutritional needs of ferns, well balanced fertilizers such as 20-10-20 or 20-20-20 need to be applied. Rates of 150-200 ppm nitrogen are sufficient. Some growers have experienced success with a lower constant feed rate, combined with a slow-release fertilizer. Most varieties prefer pH levels from 5.5-6.5. Make sure your fertilizer also contains micronutrients.

Habit: Crown

Range: Zones 10 - 10 Learn more about zones


Type: Evergreen

Collection(s): Tropical

Casa Flora Number: 19060