You can use the plant magic bio silicone alongside your biobizz nutrients, no problem at all. Ive done this with good results.. Whilst its not 100% organic it is a much cleaner silicone than most and great for soil growing but be sure to use it at no more than 0.5ml per litre every other water as it’s strong stuff.
Also there’s a lot more to silicone than just thicker stems. Take a look at the effects it has on a growing plant
Plant training/ LST can also help to build a thicker stronger plant providing you have adequate lighting
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