From what I've gathered, I need to spray Copper starting in April, then again in May and June to control both Greasy spot and Melanose.  Does that sound right?

I usually spray dormant oil with soap to control spider mites and that seems to work pretty well.

When should I start fertilizing?

I bought seeds of a few varieties to see if that helps spread out the season.  I'm guessing it will be a couple years until I get fruit from them, but there isn't much selection of plants in my area.  I ordered Black Knight, Panama Red Pandora, and Panama Gold.

sildanani, You have the same plant from the same place as mine.  This was the first year with it in the ground.  The frost froze it back to the last few inches of the plant (was 10 feet in each direction), but I will try to protect next year.  I wasn't sure how much cold it would take.  It did okay until the two nights that were 21 and 20 F back to back.  Most of my other plants did much better in the temporary greenhouses.  Is your plant is a greenhouse then?

My Valencia did that, but it was a 5' wide and tall tree in a container that got moved around a bit.  I think the stress of moving it and over-/under-watering it caused it to bloom, drop some of the fruit and bloom again.  I have both full-sized and mid-sized fruit on the tree now and it's trying to put out flower buds again.  Hopefully, now that it's in the ground, it will settle down.

Most of the trees in my temporary greenhouse are starting to form leaves and flower buds.  What fertilizer and spray schedule do you use?

I've noticed some spider mites and those corky leaf spots I've posted about before (maybe greasy spot and something else?).  Not sure, but I'd like to be better about spraying this year.

Since nobody else has stepped in here, I'll take a stab at it. 

The size of the tree is mostly influenced by the rootstock that it's grafted onto.  You're probably looking for trees on dwarfing rootstock to fit in your greenhouse.  I would grow the biggest tree you could fit into your greenhouse to max out your lemon production. 

I don't have much experience with lemons specifically or trying to stagger different lemon varieties for year-round lemons.  If I was you, I would try a few different varieties.  I have Ponderosa lemon, Meyer lemon and New Zealand Lemonade, but they are too small to be of much help here.  You can search for "best tasting lemon variety" and get a bunch of info to go off of. 

I'm in Summerville now.  Used to be in West Ashley.

I have read that Valencia orange is a "vigorous" tree.  But not sure how much different that is than other orange varieties. 

I got an email back from Lara this morning.  They said it is "Possum Purple".  That makes a lot more sense.

The plant bloomed in Sept/Oct, if I remember correctly.  The vines were about 12' long in each direction along a fence.  It set about 50 fruit.  They grew to about this size and then slowed down as the cold weather approached.  After the first frost, the leaves were burned and most of the fruit dropped.  A few hung on another couple of weeks and started to color up a little bit, drop and wrinkle a little.  The fruits in the picture are some of those.  They are not fully purple, but they are also definitely not the "baseball sized" I keep hearing about flavicarpa fruit becoming.

Bouquets de Flours citrus trees are supposed to have the strongest/best smell and really put on a lot of flowers.  I don't have one, but will probably order one and try to find a spot for it.  Not sure how often they bloom though and their fruits are not edible.

Meyer lemon is supposed to be one of the better smelling ones that has edible fruit, but to me it smells like citrus blossom with a hint of artificial grape flavor or something like that.

The one that smells the best to me out of all of my current trees is Valencia orange.  It's smells amazing and I cant get enough of it.  I have one by my side door and you can smell it 15 feet away when it's covered in blooms.  Has small flushes throughout the year between the big blooming flushes.  Plus, you get edible Valencia oranges.

Newbie question here.  Bud wood from CCPP, but where do you get rootstock?  Are you air layering branches of Swingle?

I'm no expert, but if the plant is getting too much water and you suspect the manure is part of the problem, I would dig and re-plant.  Take a look at the roots and see if they are okay.  Maybe mix in more sand this time and plant on a small mound.  Or maybe a little further from the canal.

I'm trying to figure out how to improve drainage at my new house, so I can plant a bunch of fruit trees.  There is a small stream nearby and the water table is only 2 1/2 to 3 feet down.  When it rains, the water just sits in puddles on the surface for a few days.  I thought the soil would improve by adding a lot of compost, but it still drains poorly. 

I read adding gypsum would help with clay soils, but I'm not sure.  Any suggestions before I build raised beds?