You may be right!!! Osmolarity is too high so seeds get less water -> germinate longer. I use 10 g sugar, 4 g agar and 1 g salts but it's still too high than ~ 0 ppm tds (distilled water). Seeds germinate well but take longer. It happened to me 3 times. I will try next time in vitro with coconut coir and distilled water only or with very diluted salts. However, some other seeds germinate very fast in normal media so it may depend on what kind of seeds. Anyway, Thanks !!! You're ingenious!!! Play with TC Mike ?