I will use some horse manure but I don't know when, exactly.. I dont' want to move DLs again I'd like to see some flower next year. Maybe I will add some horse manure pellets in the soil without moving plants. Clay is more fertile than sand, I never had any problem until this summer but maybe along the year some nutrient tend to dilute and using alcaline tap water for watering didn't help. Adding chelated iron seems to have helped, and now we're having some rain water.
Clay is a problem when you have to dig for planting but all in all it's not that bad, it dries on the surface but under the surface humidity stays for quite some time.
