Maybe you're either keeping them too wet or they are drying out too much inbetween waterings. Perhaps the soil is retaining too much moisture.

1. 511 is good, gritty mix might be better farther up north with cooler weather. 2. Jobe's fruit&citrus fert looks ok. didn't see any micro nutrients listed in the link, but the reviews seem good. 3. the trees look about ready to get bigger pots. but i'd wait till spring. you can repot them if your weather is going to be sunny for a couple days. 4. they could probably use a low dose of fert, especially the meyer and calamondin. i like to use 50% recommended strength. 5. in their natural environment there is no cold weather, just dry seasons and wet seasons. and many of them bloom and fruit twice a year. are you planning to provide artificial lighting? without sufficient light, the fruits will be a burden on your trees.

Here is one potential problem that jumps at at me: "it doesn't get that hot in it as it is still cool out. I come home and they are shriveling up and dying." You need a couple of thermometers in there and closer monitoring plus some sort of vents and fans. On average with the sun out it will be 25-35 degrees hotter inside the greenhouse than the air temps is outside. That is why all greenhouse type set ups have to have auto ventilation systems with good, moving air circulation inside. So if it is 60 degrees outside it can easily be 85-90 or more inside and that is lethal for seedlings. Plus it is dry stagnant air. That alone quickly dries mix and shrivels up seedlings. Second thing: "I used a mix of half soilless/seeds starting mix. They germinated inconsistently because once I took them off the mat (as the first couple started germinating), I can never seem to get the balance right with the soil moisture, and things start dying, and the rest don't germinate. I refuse to use the only soil-less mix, as many articles tell you is so perfect for seedlings." The flip side of over-watering is soil mix that doesn't drain well. That is why using a soil-less mix is recommended. Because it DOES drain well. Mix it up with other stuff and it can create a 'cook the roots' situation. But honestly I thin - based on the info so far - the real problem is the environment in your GH. It needs to be modified for better air circulation and cooling if you can't be there to monitor the plants. Post some pictures of your greenhouse and I can help you with specific suggestions. Dave

To Ohiofem, That's crazy that you've been growing tomatoes for twenty years and yet just five years you've been doing seeds! And by "new to gardening" I mean NEW to gardening. lol I liked the idea of starting from seed because you get more plants for the money, TONS of varieties to choose from, and, being a stay at home mom of an eight month old, it's been fun to take care of. :) As for heirloom versus hybrid, you ain't kiddin'. My Sungolds are the rock stars. They look awesome and are bigger than the rest. Yeah, they are also cherry tomatoes, but as others have said, a lot of times hybrids are that way-super growers. As for not as easy to grow, it's funny because yeah, my pepper and broccoli plants haven't scared me yet like the tomatoes have a few times. haha That's also good to hear that the problem isn't likely bacterial canker. I was just heartbroken thinking it might have been last night. Looked up the Tomato Girl company as a back up plan should my plants not make it. My local nursery has mostly hybrids and a few heirlooms, but none that I was really interested in. As for hardening off, I got some advice from a guy at the local nursery that my plants seemed to be too large for this stage, so I should start hardening off now to slow down their progress some. That way, he said, I wouldn't have to transplant to bigger pots within the next week or two before I plant them outside. He said then they wouldn't have outgrown the pots they're in now. To Suncitylinda, I did notice that having the fan on them helped bulk out their stems. They used to have pathetic thin stems when I first came back from vacation. See, my first year gardening I planted the seeds, then, having to go to Washington to visit family for two weeks, told my husband all the knowledge I'd learned, and then left the next day. I learned almost everything from reading online and reading forums like this, but, since it's my first year gardening, I had never put any of it into practice. lol Bless my husband's heart though, he tried his darndest to keep them alive, and they did pretty well, except they got leggy. That's what I fixed once I got back. The people at the nursery told me they were leggy, put a fan on them, and gosh darnit! It worked! :D As for sitting them outside, hahaha! Being in Utah, in a NORMAL winter(this one has been uncommonly warm), when I started these seeds there'd be some snow still in patches! Lucky you to be able to put them outside once they pot up. I'm jealous. ;) Also, thanks for the reminder about gardening is to DE-stress, not increase it. lol I know I can't be the only one who stresses about these kinds of things-I see posts like mine every day on this forum. We want our babies to grow up right, and lead productive lives, just like our real kids! ;) So thanks for all the advice ya'll and reminders to just relax. I gotta keep in mind what you said about they grow like weeds. I think maybe we do tend to over worry. I know my seedlings seem to pop back real nice and quick after a problem may arise. :) To Bobby, About the planting more than you need-I know. I'm so glad I assumed for some not germinating, and some didn't. And even still, I have three of each that popped up, so even if one died or didn't look great, I should still be fine with my planting adventures. ^_^ So, after listening to everyone, I've decided to not freak that it's bacterial canker(thank you Ohiofem!), chill and take whatever happens, and just in case my problems arose out of wind burn(as a pic I saw does look a bit similar), am hardening off my plants in our 3 sided carport, so no serious breezes bother it yet(thanks both of those to Suncitylinda!). I want ya'll experts to know. Being a newbie to a field that one could never in a LIFETIME master, I'm so grateful ya'll take the time to help people like me. I know you must get tired of all us new to growing asking you so many questions about possible diseases, how to plant, what varieties are good, but I know, at least for me, knowing ya'll are willing to answer our questions definitely keeps me going. It's so easy to get discouraged, worry you don't know what you're doing, so it's nice to have ya'll telling us we're doing alright and keep it up. :) Hopefully that doesn't sound too cheesy, 'cause I mean it.