I get the serenade of the mockingbird in the morning. It is sweet and gentle and I can hear an answer to his callings.

How sweet the songs are and I am sorry yours took flight!
As an aside, I went to a fair this weekend and here is what one of the growers printed out, pertaining to your lemon tree!

HOW TO GROW A LEMON TREE INDOORS
STEP 1 – PLANT IT
I bought my lemon trees from The Green Barn Nursery and then simply filled a large pot with Pro Mix Organic All Purpose Potting Soil and planted them in. Simple.

STEP 2 – GIVE IT SUNSHINE
You must place this tree in a south facing window – or else. No ifs, ands or buts. You will NOT get any lemons and your tree will not thrive if it does not receive the proper light. Lemons love sunshine – the more, the better.

STEP 3 – FEED IT
I keep the tree well fed throughout the year with fertilizer. I use worm castings as well as Neptune’s Harvest Organic Fish Seaweed Fertilizer. Fish and seaweed are some of the world’s best natural fertilizers. You simply mix one ounce of the fertilizer in a gallon of water and pour evenly around your tree.

Neptune’s Harvest Organic Fish Seaweed Fertilizer is cheaper for me to buy on Amazon, but may not be for you. @theoldwalshfarm.com

Hope this helps!