Green Poison XL Auto - Czech Republic

I germinated the seeds directly in the final 20L pot. I was on 11 May. I used: - 70L of BioBizz LightMix - 8 L perlite - 10 L expanded clay balls - 0.5 Kg Guanokallong powder Tried to get the components more or less evenly. I first irrigated the pot without the seed with mineral water 320ppm and pH 7. I made a hole of about 1-2 cm deep and then put the seeds. I covered the pots with plastic film. They where kept in my room. The 3rd day appeared the first seedling. The 4th day there were 3 seedlings out. The 5th day appeared the last one. It kept the shell and the cotyledons where not apearing. I decided to left it on its own. The 7th day the shell was still, the seedling with the shell measured less than 2 cm while the 3 others were about 8 cm high.