freeland
New Member
Posts: 2
Joined: May 2020
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Post by freeland on May 7, 2020 11:59:02 GMT -5
I'm successfully growing hydroponic lettuce to maturity year-round under T5 grow lights in a heated 8 ft x 20 ft greenhouse that is mainly devoted to growing tomatoes. I'm new to this forum and not sure that there will be interest in my post to this thread so I'll just add a photo taken Feb. 29, 2020, and try to answer any questions. I typically plant replacements every Sunday for the lettuce we consumed that week. The similar age shown in the photo is unusual because the planting schedule was adjusted in anticipation of guests arriving March 1st. May 10th edit: Initially I was getting a lot of tip-burn -- especially on younger lettuce leaves. After ruling out too much sodium in the source water and inadequate calcium in the nutrient solution I tried increasing ventilation. Adding the small USB fan shown in the upper left of the photo permanently solved the tip-burn problem.
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Post by pepperhead212 on May 7, 2020 16:30:15 GMT -5
Welcome to the forum!
I grow lettuce and herbs in hydroponics in the off-season, under t5 bulbs in my basement. I just pulled out the lettuce, since I have it outside now, and I wanted to set up the cloner, to get the herbs ready for outside.
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Post by september on May 7, 2020 21:33:27 GMT -5
welcome freeland, how many weeks of growing does the average lettuce plant need in your set up, to be of consumable size? Sounds like you have plenty of room in your greenhouse, how many succession trays do you normally have going and what area of the country do you grown in?
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freeland
New Member
Posts: 2
Joined: May 2020
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Post by freeland on May 8, 2020 13:48:11 GMT -5
welcome freeland , how many weeks of growing does the average lettuce plant need in your set up, to be of consumable size? Sounds like you have plenty of room in your greenhouse, how many succession trays do you normally have going and what area of the country do you grown in? September: Thanks for the welcome. The time required to reach harvest size varies a little depending upon the variety of lettuce. Six to seven weeks from planting seeds is typical although the Oakleaf variety seems to need another week. The greenhouse is heated to suit tomato plants so the lettuce nutrient solution is cooled which allows mature lettuce to be held another week or two without bolting. The greenhouse is a solarium style that is attached to the south side of the house. It loses otherwise usable space because of two doors with steps located on the N & S sides instead at the E and W ends of the center aisle. There's room for about nine tomato plants, the lettuce raft set up and two succession trays (one used for germinating and the other for seedlings and cuttings). Freeland is on Whidbey Island which is north of Seattle. May 10th edit: I should add that the lettuce raft has 8-inch spacing and is made from food grade material by Beaver Plastics. The 1-inch square holes have raised rims that provides a small but very important air gap so plants can be positioned just above the nutrient solution. GrowGrip brand 1-inch reusable plant holders made from food grade #4 LDPE work very well. I do not accept any form of compensation for mentioning brand names.
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Post by september on Apr 15, 2021 10:54:51 GMT -5
I was looking at some other hydroponic Kratky method videos and came across this one for lettuce. This lady does a nice job showing all the steps needed for growing lettuce in quart mason jars.
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