Why not start out with a good soil mix in the first place? For your next grow, here's a good mix:
2 parts Schultz's "Potting Soil Plus."
1 part Perlite.
1 part Vermeculite.
1 part Worm Castings.
Add to the mix one SMALL handfull of granulated dolimite lime.
Mix it all up well and off you go to grow prized pot plants.
You won't need any fertilizers for the first 45 days with this soil mix.
Vi