Hi @Georgette_piglet! Lack of light and a poor airflow often lead to these symptoms. You can always add more soil into the container, to support the stem at its basis, but be warned this can bring root-rot if you put the plant deep into the ground. The best thing to do is to decrease your lamp-to-plant distance and add a small oscillating fan, in order to get a continuous fresh breeze onto these babies, this will reinforce the stems. On the nutrients side, silica can also help to get strong stalks. Let me know in the comments section if you need any further information, and happy growing! 👋
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