For the past 4 or 5 years I have been trying to Grow an Avocado tree from Seeds of avocados that I buy in the grocery store. None have sprouted. I remember in younger years doing this frequently, and I'd say about half of the seeds sprouted. They usually succombed to negligent care later on, but it was not hard to get them started. Now, I cannot get any to sprout. Is this because of they are being irradiated? They are not labeled as being irradiated. I have even bought organic avocados with no sprouting success.

I bought the book The After-Dinner Gardening Book by Richard W. Langer some years ago. (Actually recommended by a reader of this blog.) The book is out of print, but you can buy used copies. It tells about a New York City man's obsession with growing plants from seeds and remnants of foods eaten. It's an engrossing read, but I doubt that Mr. Langer would have as much success these days.