Umtopfen zu Beginn der Vorblüte?

Yes, repotting is still possible – but with caution. Advantages of a larger pot now: More space for the roots = better nutrient uptake during flowering. More stable water and nutrient supply, especially important in hot weather. More buffer storage for nitrogen – this is crucial during the stretch phase of flowering. Disadvantages/risks: Stress from repotting can slightly delay pre-flowering. Root damage or poor drainage in the new pot can be harmful. What I recommend: ✅ If you plan to repot, then do it now – right before or at the beginning of pre-flowering is the last sensible time. Recommended approach: Pot size: Go for at least 25–30 liters, even larger if possible. Repot gently – do not break the root ball apart too much, rather "relocate" it. Right after, water well with light nutrient water (e.g., 50–70% of the flowering nutrient concentration). Avoid direct sunlight for 1–2 days to help the plant recover. Alternatives: If the risk is too great for you: Top-dress with fresh soil and compost + slow-release nitrogen source (e.g., worm humus, horn shavings). Leave or renew the mulch layer (as already seen), helps against drying out. Adjust liquid fertilization: e.g., lightly dose every few days with growth or pre-flowering specific fertilizer (including Mg/Ca if needed). I hope this helps you! 😘