im watering them about once or twice a week(when the soil looks dry). i fed them on aug. 13 (as directed on package) with heavy harvest fall blend from advance nutes. i usually use water soluable feed, but this time i tried something new. i thought i may have put too much down aswell. i checked the soil w/ a cheap soil test kit. it came out highin p and k but very low in n. could this be from too much p or k?