Note to me :
Dahlias grows best with NPK red, no epsom required
Roses are ok with NPK green but you must feed sulphur regularly or epsom
Hibiscus, dont feed NPK red, they sulk, dont feed epsom they dont want it, stick to NPK green 15-15-15 and sulphur maybe three months once. They also dont like pots much.
Hydrangea, stick to baja kopi O, never use NPK green or red or whatever, a bit of sulphur or epsom sparingly.
Torenias-plonk them in good garden soil and let them be.
Portuluca -i dont know what they want, tried everything, NPK, organic, kopi, epsom... the foliage is great but blossoms lazy-ok, i forgot to deadhead, im going!
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