I don’t believe this is a boron issue.
Frankly, I wouldn’t be concerned about it unless there are coinciding symptoms.
Looks like a healthy plant to me. Let her do her thing for a few days before taking any significant measures
Good luck
@Budders, Thanks bro, worked wonderfully last year. Only been using fabric since I started growing. Give's much needed Air to the roots. Sweet Smokez <3
Que maravilha ✌️
Boa sorte no cultivo e aproveita o desenvolvimento 👍
E no final que tenhas uma grande colheita 🌱🌱
Se quiseres passa pelo meu diário e deixa o teu apoio