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Gardening News

January
2011

 

 

 

 

By
B. Rosie Lerner

Extension Consumer Horticulturist
Purdue University

 

Norfolk Island Pine Needs TLC


 

Unlike most pines that are familiar to Midwesterners, the Norfolk Island pine is far too tender to plant outdoors in our climate and, in fact, is not a true pine at all. But the good news is that it makes an elegant houseplant when given proper care. It also makes a terrific living Christmas tree; its lush green twigs of soft needles provide a lovely backdrop for festive holiday ornaments.
norfolk island pine
Norfolk Island Pine

Known botanically as Araucaria heterophylla, the plant is native to Norfolk Island in the South Pacific between Australia and New Zealand. The ideal indoor climate for this species is bright and cool, with daytime temperatures ranging from 60 to 70 degrees and slightly cooler at night. Although the Norfolk Island pine will adapt to bright indirect light, the plant will look its best with a couple of hours of direct sunlight daily. If the light source is coming from just one direction, you'll want to rotate the plant a quarter turn weekly to keep it from tilting toward one side.

When the plant is growing, feed with a fertilizer formulated for indoor foliage plants. It is not unusual for the plant to be in a period of rest during the winter months, at which time there is no need to fertilize.

Water the plant when the top inch or so of the soil in the pot feels dry. Use enough water to allow a little excess to escape through the bottom drainage holes. Discard remaining drained water after about 15 minutes.

What is most challenging for the typical home gardener is giving this plant the high relative humidity it needs. Norfolk Island pine thrives at 50 percent relative humidity, yet it is not unusual for the average house to drop to 15 percent during the winter heating season, unless steps are taken to increase moisture in the air. Running a humidifier will increase the comfort of people and plant and is the most effective way to adequately raise the humidity.

It is typical for a few needles on the lowest branches to turn brown and drop. If this happens slowly over time, it's likely just normal aging of the branches or possibly from lower light availability; however, if many needles are browning, or if the problem appears more widely distributed among the branches, look to problems of either too much or too little water, hot or cold drafts, or too little relative humidity.

Garden centers and mass merchandisers have an impressive selection ranging from compact desktop plants to large floor plants rivaling a traditional holiday tree. When given proper care, the Norfolk Island pine will outgrow most indoor spaces, not surprising when you consider that it can reach up to 200 feet tall in its native habitat!

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Writer: B. Rosie Lerner

Editor: Olivia Maddox, (765) 496-3207

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Last updated: 21 January 2011

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