When to flower !? To tall for tent after strech ?!!

I'm currently growing BC blueberry from highgrade seeds. I'm in a 5 foot buy 2 foot by 6 foot high tent what the 600w mh. I will be going to a high pressure sodium for flower. They are in 3 gallon pots at the moment and they are 13 inches tall. I am very worried that they are too tall to flower without stretching towards the light. They have been in the 3 gallon pots for two weeks I did want to transplant into 5 gallon smart pots before flower but I don't know if I will have time . Any input on if this strain stretches very far. Also I'm worried that they will get root bound that is why I wanted to transplant. And if anybody knows or has experience with the blueberry strain and how far they stretch during flower that would be awesome. Can I flower in 3 gallon pots? They are very healthy and growing very very fast any input would be much appreciated thanks sorry for the long post? View attachment 2211674View attachment 2211675View attachment 2211676

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Looks good..ppl on here say alot..but do what you think you should do. imo I would've started less plants.. I made the same mistake . .. peace and love

You could scrog them or do som LST

I will only be flowering 4 of them. the others are sativas and I'm going to give them away lol. I am doing lst they have just got crazy in the past few days.

All Depends on strain......They can get 2-3x their size.

i'm not familiar with that strain, but i would repot to at least 5 gallon pots, i have used 3 gallon smart pots and get much better results using 7 gallon smart pots now.