You could use something like floralicious plus by gh if you want something more natural. I think it has the max reccomended dose of seaweed extract. Look up ascophyllum nodosum extract. Other than that there are inorganic options like house and garden shooting powder but it's not much of an option in soil.
Here is the supporting evidence so you know I'm not talking out of my ass.
If you are just looking for good sources to add in the later stages of flower I like langbenite and seabird guano. The guano has phosphorus and calcium and langbenite has potassium and magnesium. Down to earth sells both but there are cheaper sources of seabird guano if you look around.
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You could use something like floralicious plus by gh if you want something more natural. I think it has the max reccomended dose of seaweed extract. Look up ascophyllum nodosum extract. Other than that there are inorganic options like house and garden shooting powder but it's not much of an option in soil.
Here is the supporting evidence so you know I'm not talking out of my ass.
https://www.frontiersin.org/articles/10.3389/fpls.2019.00655/full
If you are just looking for good sources to add in the later stages of flower I like langbenite and seabird guano. The guano has phosphorus and calcium and langbenite has potassium and magnesium. Down to earth sells both but there are cheaper sources of seabird guano if you look around.