Vietnamese Landrace Sativa monster

Another good week, all going well, slight clawing on some.of the leaves, I'm guessing it's from the nutrient rich soil I'm growing in. I trimmed a good few fan leaves off simple because they were shading my other plant's. My dilemma is now that due to the furious rate at which this plant is growing, and looking at the space I have available, I think I'm going to have to put them into flower earlier than planned, I'm thinking that they will perhaps double from their current size, which would have them pressed against the roof of my grow tent. Was thinking on veging for at least 6 weeks. But looks like it will be 4 and a half.