Sean, as long as your Vigoro has micronutrients, that's fine, but I would also hit it with a foliar application of Grow More Citrus Growers Blend. It is something you want in your "citrus arsenal" here in S. California. With all the heavy, cold rains we've experienced in the last 2 years, you're going to run into the same issue I have with citrus in the ground (my soil is mainly DG here in N. San Diego county near the coast): a leaching of micronutrients, especially magnesium. So, start with the Vigoro, but do make a foliar app with some micronutrients. You'll see the difference, promise :-) And Tim's right, no pruning for now. Wait until you obviously need to do some MINOR shaping. Remember, with citrus, pruning equals no fruit. Citrus produce fruit at the tips of their branches, so you're cutting off your next fruit crop when your prune! And Tim's advice about removing suckers is right on. Just break them off if they're soft. If they've hardened off, trim close to the rootstock. Our water isn't too alkaline here in San Diego county - about 7 to 7.6. Fine for citrus. But, for your little guy, acidifying the water with some vinegar and pouring it over the fertilizer may help prevent the micronutrients from getting locked out due to the alkalinity. You guy needs a bit of a rescue. Tim's advice is good. Once recovered, you probably won't need to acidify your water. You can also achieve this with your foliar application - acidifying the water you use to dissolve your Growers Blend in. When you pick up your moisture meter, pick up a decent pH meter (don't buy the cheapest one). It's worth having these in your gardening tools. I've had both my moisture meter and my pH meter for many years. Great tools to have! Patty S.

Those yellowed leaves look like older leaves, in which case this is normal. If you are worried about salt buildup, flush the soil with plenty of water, perhaps 5 gal. How often one needs to water depends on, among other things, the nature of the soil mix and the amount of rain that falls. In my case, during the summer, I water only the trees in 5-1-1 mix about once a week and the ones in gritty mix about twice a week.

Ali, Steve made a great point! At least 16 hours of light by now. What kind of light is that and how strong is it? Does it get any sunlight at all in a south facing window? You could use any good soilless mix you find there, but youwould have to gauge how fast it dries and whether or not it's good for the environment you have it in. Options You could use a clay pot with a good soilless mix. Miracle grow will work if you add more perlite to it, or even bark mulch, pine that is. You could use straight 'pine bark' or 'hemlock mulch with added lime. That would be very porous. You could use the mulch with added perlite even more porous. You could use mulch mixes with peat and perlite. As you can see, there are options, just become creative with a mix that does not hold perched water and that can rot or suffocate your roots. In your situation you most likely need a mix that is very porous and that dries out evenly and quickly like within a couple of days which I likje ro wthin at least a week. ) I wish everyone that grew citrus in containers could understand the concept or how water behaves in planted containers and how to make mixes work best for their trees and grower. There is plenty to learn at the container forum if you ever wanted to know more) While you stay safe, here is something you might enjoy reading) https://www.gardenweb.com/discussions/5894651/container-soils-water-movement-and-retention-4-11-20#n=14

Every year we get fantastical explanations for chlorosis in the fall. All anyone has to do is stick their head out the window and look for fall colors. If you see Maple trees turning red and yellow your citrus will have chlorosis soon enough, unless you supplement them with artificial light. At least a dozen maybe more reasons this is clearly not a salt build-up. Toronto Canada gets only 150 hours of sunlight in October. A small fraction of that if you are growing in the window. Yes Jeff you need a grow light and a grow tent if possible. It is that time of year. Sonnet 73: That time of year thou mayst in me behold BY WILLIAM SHAKESPEARE That time of year thou mayst in me behold When yellow leaves, or none, or few, do hang Upon those boughs which shake against the cold, Bare ruin'd choirs, where late the sweet birds sang. In me thou see'st the twilight of such day As after sunset fadeth in the west, Which by and by black night doth take away, Death's second self, that seals up all in rest. In me thou see'st the glowing of such fire That on the ashes of his youth doth lie, As the death-bed whereon it must expire, Consum'd with that which it was nourish'd by. This thou perceiv'st, which makes thy love more strong, To love that well which thou must leave ere long.