Pre bloom booster?

My plants are honestly healthy this is my first grow I've never participated in any form of marijuana growing. My dad grew hydroponically and I did not like the quality or quantity of product he was producing so I decided to grow in soil. This is again my first time I am having healthy plants and I'm wondering prebloom or around that week in bloom is there a booster I could provide my plants even if they're looking healthy to raise the trichome level
 
My plants are honestly healthy this is my first grow I've never participated in any form of marijuana growing. My dad grew hydroponically and I did not like the quality or quantity of product he was producing so I decided to grow in soil. This is again my first time I am having healthy plants and I'm wondering prebloom or around that week in bloom is there a booster I could provide my plants even if they're looking healthy to raise the trichome level
 
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