Looks like to me Leaf Burn,
or Over fertilization ,
or PH problem
New Plantlets
I've moved the plants in question to a lower-light end of the shelf and will repot when I get a chance. The good news is that it's not a sign of bugs, so I'm not panicking about isolation!
nannanavarro
where in world did you get such large dome?.i am looking far some,i have some but need the larger ones.
I found it in the spring at our nursery. I have also seen them on line. Our nursery only carries the domes in the early spring for seedlings. I am waiting for next year to buy two more. They are wonderful. My new plantlets just about reach the top of the 6 inch dome now.
Wish I could be of more help. I am sure you will be able to find some on line. I did a google search for - large dome to cover plant trays - I will try again and see if I can post the information for you.
the domes are available online at many indoor gardening stores. Here are a couple
http://plantitearth.com/store/product.asp?pid=181&catid=1
http://www.wormsway.com/detail.asp?sku=MGT
Thanks Keyring. The one I have is the first site for 5.95. It is a little small for the big trays, but it works just fine. By a little small I mean less that 1/2 inch. They fit perfectly on the black trays.