I have 20-20-20. I use it half strength and assume it equates to 10-10-10. Hope that's how it works.toss some 10-10-10 on it if you have it and get those roots going. Can use it every 3 weeks with regular watering
I also dumped a 5 gallon bucket full of compost in the hole below the tree. Hoping it provide some drainage, moisture retention and nutrients.