My damson tree's never been that happy, it always gets attacked by aphids which make the leaves curl. This year for the first time I managed to harvest enough damsons (sour plums) to make Damson and Apple Jam. All the books say damsons make the best jam ever - they are SO right. They give the jam a very sharp taste without it being bitter. I only got enough for 4 jars (or was it five?). I'll sort those aphids out next year, I'm not having damsons in distress nay more, they're just too nice!
