Hi, is it normal to be hollow in the middle?

Hello. Some confusing answers there. I find that the higher THC strains generally have hollow stems, not all. If you are pruning and haven't flowered yet, this may be a good plant. Keep a eye on it. I've found this type of stem in both hydro and soil grown plants. Good Luck Chuck.

Да, дружище 😃👌 полость в сердцевине - это нормально для взрослого растения на вегетации, как твоё. 😇👌

it's the work of the devil!

Very normal! I only grow in soil, and I believe strain determines the makeup of the plant structure. I harvested great grows, and some strains showed this trait

I believe it's common in hydro setups because hydro setups are missing one of the most common elements in soil: silica. Get yourself some Armor Si. Use it sparingly and ALWAYS mix it VERY WELL before you put anything else into your feed. If you don't it will gel your other nutes. Don't worry though, you only need to add very little (1mL/gal works), so if you stir well you will have no issues.

http://aob.oxfordjournals.org/content/75/6/587

I found that study, its pretty old and its on tomatoes but still....

Its very common in cannabis and never really an issue however it seems more prevalent in hydro setups. I did read an article on tomatoes once which stated that its a carbon deficiency which makes sense when you think about it being more prevalent in hydro setups but again it doesn't seem to drastically change anything except perhaps making training older branches a little more difficult without snapping them. Many will say it makes for better water and nutrient transportation but I've not seen any definitive work on this.

Hello Its ok to have those hollow stems. I used to make my 1st clone from the "top " site and often hollow. Just make sure debris or contamination doesn't get in there. If the stems were hollow and weak...then thats a bad sign

Yes that's completely normal, that's where the hemp plants transport the amounts of water they're drinking. Imagine it being a giant straw :) Nice looking plant btw, keep doing what you're doing, Cheers