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How to Grow a Citrus in a Greenhouse

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How to Grow a Citrus in a Greenhouse

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Overview

Louis XIV of 17th century France grew 3,000 orange trees in a greenhouse called an orangerie, and so have others who crave a glass of fresh juice in climates that are too cold for citrus to grow outdoors. If you select a dwarf variety of orange, lemon, lime or tangerine, it will fit nicely into even a small greenhouse. Growing your citrus in a large pot is helpful, because all types of citrus trees love the natural sunlight and will benefit if you move them outdoors, as Louis did, in the summer months.

Step 1

Plant your citrus tree in a large pot with at least one drainage hole, using a standard potting soil mix. Make sure to leave the root collar above the soil line and the root crown just below. Move it into your greenhouse in fall, before your first frost.

Step 2

Provide sufficient light for your citrus tree: if your greenhouse does not receive at least eight hours of sun, hang a grow light or a fluorescent shop light above your tree.

Step 3

Maintain a temperature between 55 and 95 degrees Fahrenheit.

Step 4

Water your tree when the soil becomes slightly dry.

Step 5

Fertilize your citrus tree with a plant food designed for citrus or one having an N-P-K ratio of 3-1-1 because they need a good amount of nitrogen. Repeat your fertilizer application every two months during the tree's active growing season (spring through late summer). Don't fertilize during winter.

Step 6

Prune suckers and water sprouts from the base of your citrus tree when you see them starting to form. You can also prune your citrus tree to keep it a manageable size for your greenhouse.

Tips and Warnings

  • Treat insect pests with insecticidal soap if they occur. Control snails and slugs with organic iron phosphate granules ("Sluggo") or traditional snail bait.

Things You'll Need

  • Bare root citrus tree
  • Large container with drainage hole
  • Well-draining potting soil
  • Citrus fertilizer
  • Grow light or a fluorescent shop light
  • Hand truck or dolly

References

  • Four Winds Growers
Keywords: citrus trees, greenhouse gardening, oranges lemons

About this Author

Barbara Fahs lives on Hawaii island, where she has created Hiā€˜iaka's Healing Herb Garden. Barbara wrote "Super Simple Guide to Creating Hawaiian Gardens," and has been a professional writer since 1984. She contributes to Big Island Weekly, Ke Ola magazine, GardenGuides.com and eHow.com. She earned her B.A. at UCSB and her M.A. from San Jose State University.