Household Products as Ferts
What kind of household products can be used as ferts? I only know that Epsom salt can be used because it is MgSO4. Are there any other household products that can be used?
I've never used ferts before so I am a complete noob in the area... Can I use Epsom Salt alone or do I have to add others too? I googled some recipes and know that some people mix Epsom salt with other not-so-household products. I don't have any high tech setup so it's not really a big deal if I dose ferts or not but just thought if Epsom Salt will make my plants happier, why not... I do add Fluorish Excel since I have a bottle.