You're soil is stable--it's just has a very high pH--You should mix some sphagnum peat moss(has acidic pH 3.3 to 5.5) You want your soil to be 6.3 to 7 with 7 being max. You're feeds and watering's should be with a close to 6.3PH. You could also use sulphur to lower the pH but takes longer to...