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Starting seeds under fluor

Posted by johnweeder 5B (My Page) on
Mon, Dec 3, 07 at 20:20

I want to try starting seeds indoors. I don't really expect to save money doing it. I am hoping to get the specific plants I want AND possibly get larger plants at transplanting time. Mostly, I will be starting flowering annuals. (bear with me for the lighting part of this...)

Q1) Will starting them earlier give me a longer bloom time?
Q2) Is it reasonable to try and start my own seeds or am I better off just buying plants at the nursery?

I am intending to start the plants in standard nursery flats. I figure I will use between 4 and 8 flats.

Q3) What size inserts should I use? I don't want root bound seedlings but I also assume there is a practical limit to how large I can grow and still be able to transplant. I am thinking 1203 or 1204 inserts.

I plan to use T5 4' fluorescents. Per lumen, they seem the best value.

Q4) How many bulbs in the fixture? 2? 4? 8? Obviously, I want the minimum that will do the job.
Q5) What is the best way to orient the flats under the fixture? Can I put 4 1'x2' flats side by side under a 4 bulb fixture? Cost is the determiner. It seems cheaper to do 1 4 bulb fixture w/ 4 flats then 2 2 bulbs fixtures with 2 flats each.
Q6) Is a mix of bulbs best?

Thanks in advance.


Follow-Up Postings:

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RE: Starting seeds under fluor

Q1. Probably not. You can buy bedding plants ready to flower as early as you could possibly put them in the garden and before.
Q2. Makes sense if you need a lot of plants on a small budget or if you are very particular about varieties and colours which may not be easy to find.
Q3. To some extent this depends on the plants. I mostly go with the six-pack (1206) size but some bigger plants are definitely rootbound in these. Go with whatever size will give you the number of plants you need from the space you have, and don't sow too early. You will probably only need to grow under lights for about a month, then harden off to outdoor conditions for a few weeks, then plant out. A few "annuals" such as Impatiens are a little slower.
Q4. Use one T5 tube to cover about 6" of width of plants, 4' long.
Q5. 4 1'x2' flats will work nicely under a 4 bulb fixture, but watch out for the plants at the edge leaning in because the four tube fitting is less than 2' wide and won't fully light the edges. You may need to turn the trays occasionally.
Q6. I think you only have a choice of 6500K and 3000K bulbs, you can use 4x6500K or two of each, I don't think you will notice the difference. Don't use just the 3000K on their own.


 
 

 

 


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