So unfortunately I couldn't do Lst due to the main stem being to hard. The top part was bending but just stopped and went hard also. I gave it 500ml of just water with ph of 6.5. So I am just gonna let it grow. I think round about 3 weeks is better for Lst ,due to the plant still being able to flex because in 3.5 weeks only the very top part was able to bend but week 4...no chance. I did try ,hence the main stem looks slanted.