Why not write (and mail) a secret (invisible) love note? You could even include the movie National Treasure 1 along with it (with a note that tells him the blank page is a 'clue') and see if he figures it out.
Know your soil - do a Mason Jar Soil Test. I did this years ago when I first started gardening. I ended up adding sand to my garden spot. I have had poor soil conditions for the last 10 years or so and have added organic material and composted material