Green tomatoes

andys_garden(20854)January 30, 2005

Probably an easy question for the forum but here goes:

My tomato plants have beautiful green tomatoes-- the problem is they have been green for over a month! I am using conventional fluoescent lights with a 12 hr on/off cycle. Is the use of conventional fluorescent lights the problem? Any other suggestions?


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shrubs_n_bulbs(z8/9 UK)

I believe that fruit ripening is heavily influenced by the carotenoids. These are most responsive to blue light, around 450nm-550nm. Your fluorescents may be giving you too much red and not enough blue. Try looking for a higher kelvin rating, such as a 6500K or "daylight" bulb.

    Bookmark   February 3, 2005 at 7:11AM
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cbars(z5b6a MO-Kansas City)

Ambient temperature is also important. Ripening occurs best if temps are 75+ in the room. If the area is 50-60, ripening will be very slow.


    Bookmark   February 3, 2005 at 11:19AM
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shrubs_n_bulbs(z8/9 UK)

Tomatoes can be made to ripen by putting them in a paper bag with an apple. Alternatively, pack them in newspaper in boxes with a few apples. Apples emit a gas that ripens fruit, including tomatoes. We have to do that in this country because very few tomatoes ripen on plants grown outdoors.

    Bookmark   February 3, 2005 at 12:58PM
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jwmeyer(Z8 OR)

Sounds like the problem is your light source. Fluoescent light is ok for seedlings and vegin' but to produce nice big fruit indoors you need an HID and a good reflector. Check the Philips ceramic metal halide,(CRI 85) or the hortilux Blue (CRI 92). Both are white light that are excellent for both stages of growth. These bulbs produce better blues and reds than combining a HPS and a MH....Both are realitively new on the market in the higher wattages, and the things you can frow under them is amazing....Hope this helps.

    Bookmark   February 13, 2005 at 12:12AM
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