Questions on: Grapefruit

Ron Smith, Horticulturist, NDSU Extension Service
Q: I planted a grapefruit seed five years ago in a planter inside my home. I feed it once a month and water it about every two weeks, but it never flowers. The one I had before produced at least one small grapefruit each year. The plant has a southern exposure. I never take it outside during the summer because the bugs will eat it. Can I do anything to encourage the plant to produce fruit or is this one just a dud? (e-mail reference)

A: This is probably a combination of being a dud and you being too good to it. Mild stress will tend to get a plant into the reproductive cycle. I would suggest that you place it outdoors during the summer and provide the necessary protection from ravaging insects.

Q: Can you tell me what the enclosed plant is? I think it might be a grapefruit, orange or apple tree, but I am not sure. I planted the seeds in my house last fall with my flowers. I also would like to know why the leaves are curling up. What kind of soil should I be using for it? (Fargo, N.D.)

A: You are growing a citrus of some kind—most likely a grapefruit. The problem is likely the lack of free drainage with the container it is growing in.

Use the soil you can purchase for houseplants. I find the Scotts brand to be the best for my efforts. Also, get a free-flowing container with an attachable saucer. Give the plant as much direct sunlight as possible and summer it outdoors.

Q: I have a grapefruit tree that is 7 inches tall. It grew good last fall, but in January the leaves started getting spotty. I think it may be caused by tiny spiders, as I
could see some sap leaking at the ends of the leaves also. Could you tell me what the problem is and what to use to get rid of it? (Minot, N.D.)

A: I'd say you are correct--spider mite damage. Spray the entire plant with insecticidal soap, or dip it into a prepared solution, to completely cover the
foliage. Once under control, mist the plant frequently with distilled water to keep the population from building up again.

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