https://torasavigdor.org/15th-of-shevat-fruit-of-the-tree/
Even if you missed reading it prior to a Tu B'Shvat Seder, it still contains many good lessons & insights for the day and for all areas of life:
https://www.bilvavi.net/files/TuBShvat.In-Depth.Analysis.of.the.7.Species.pdf
