Hi everyone, I'm hoping someone can help me with my cherished lemon tree. I planted the tree from seed 18 years ago in a pot. I live in what I believe is Zone 5b (Nova Scotia) so I bring the tree out onto the deck in the spring after the last risk of frost where it enjoys full sun and generally responds by producing lots of new lush, dark, shiny foliage. This year, however, the leaves were prolific but pale, with dark veins showing, and little to no lustre.
This tree has flowered a little in the recent past and once actually bore us some tiny yellow lemons. I've attached photos of its general condition and leaves. I've brought it indoors now, and it's in a southwest corner with lots of light, in rich organic soul in a 16" pot (a bit root bound), no drafts, stable temperatures. I've given it bloodmeal and other high nitrogen fertilizer. I've not seen any pests.
If anyone has any practical suggestions, please let me know. I'd really appreciate your insight and experience as this tree is like a member of the family now. Thank you.