userlaneanswered grow question 14 days ago It depends on many factors, such as the size of the container where you have your seedlings. A rule of thumb is to make sure that the soil stays moist but not overwatered; never let it dry out completely at this stage. For example, if you use a box like an X-Stream heat propagator together with Jiffy propagating plugs, you just need to spray the inner walls a couple of times a day with a water spray bottle after the initial watering, and then add water when the tray starts to dry out, which can be anywhere from 2-6 days depending on other factors, such as the ambient temperature in the box. If you use soil created for seedlings, such as the Canna Terra Seed Mix, you can start adding nutrients right away according to their recommended feeding chart. If you planted your seed straight into the final container, you may need to add water more regularly than in a propagator box, but as long as the room stays at an ambient temperature of around 26.5 degrees Celsius (79.7F) and 60% RH, it might be exactly 3 days that you need.