Tanuki wrote: Since you had the trees, I'm curious about one area. We got conflicting info from the staff about using plant nutrients. They told us to use it a month or more after the fruit finished, and then it would flower again. My wife found some things on the net that said otherwise. What regimen did you follow? We'd like to keep flowers and fruit coming all year.

I wanted to continue this topic, and I missed the above post at the time.
I don't recall there being a fruiting season with the kalamansi. What we'd do is trim off any fruit when ever it became available. That alone seemed to trigger further fruiting. Initially I had left the fruit on until needed, it can start to yellow, but is still tasty, though looks a little questionable I suppose. But the latter seemed to halt further fruiting.
I think the conclusion is that each plant has it's idiosyncrasies of likes and dislikes, and one thing seemingly leading to another. ...
I found a yellow palm down by the rubbish bins a week or two ago, and it wasn't looking happy. So I brought it home and put it on our balcony. Mrs JR8 asked why on earth I'd bothered with a half-dead plant, but I couldn't walk past an abandoned/sick puppy either
First I pruned off the dead/terminally sick stems. That shrunk it quite a bit, but what was left had a chance I thought. I put it to the front of the balcony where it would get good sun. I mean palms love sun right? Looking into the cause of yellow spots on a couple of fronds suggested potassium deficiency. So I got an appropriate plant food from NTUC and gave it a thorough watering with that.
[Visions of me soon to be sitting in the shade of a gloriously huge and healthy palm...].
What I hadn't considered was this was too much of a good thing. Like a man found crawling in the desert, it's counter-intuitive but handing him a pint of water could trigger his death. I reckon this had maybe been an indoor plant, and it had perhaps never been fed. The foliage rapidly started turning yellow, even the younger fronds. It's called a yellow palm, but it's only the older fronds that yellow over time.
Looking into it, it seems these palms need indirect light. Too much direct sun is positively bad for them. So I drew it to the back of the balcony which should suit it better. I'm being careful with the watering, I think plants like this benefit from it not being too generous, it encourages growth (plus the substrate seems perhaps like an over-rich, and water-retaining mix). And indeed within two weeks it rapidly sent up three new 'spears'.
What I also hadn't considered is mealy bugs. There are no other house-plants nearby that I can see. I've never seen those ever-so-pretty but carriers of pestilence and botanical death, the huge butterflies, at this current flat of ours. And yet within a week or two I noticed it was getting the dreaded mealy bugs!
Turns out they're particularly fond of over-fed plants. And the problem is once you have mealy bugs, you can also gets ants, that live symbiotically from/with the bugs. [Last time that led to us having a *full-on* ants nest in my study!! - unbelievable, when I accidentally disturbed it it was like something from a horror film].
So. Indirect light. Don't feed more than once a month, don't over water, and remain vigilant for bugs.
To deal with the mealy bugs I did some research. Previously I've used some hard-core pesticides, but I really don't enjoy applying that stuff, especially in a breezy area. What I found recommended was spraying with a soap solution. Washing up liquid + water, to a similar concentration you might mix for washing up. Put that in a pump bottle, and spray the plant all over twice a day. Making sure you get into all the nooks and crannies, especially say where the base of the fronds join the frond stem, where the frond stems join the main plant, and even over the surface of the potting substrate. Simple, takes two minutes.
Within a week all mealy bugs are gone (I think!). I'll now cut down to spraying once a day for a week or so, and then later on rely upon weekly visual checks. So for the meanwhile, I think I've managed to find a happy equilibrium for this plant. Fingers crossed!