Anyone know why my plants are so small at 3 weeks?

kid cannabis said:
lack of root development will slow the uptake of nutrients. im not saying its deffinitely the answer just a possibility and something worth thinking about. its simple small root doesnt work like big root. why do you think most larger plants use more nutes? the root systems are more mature and have developed more than a small plant. under developed roots could have slowed the growth then he might think o nute def and nuted them..... then boom you have a small plant that has yellowing leave from nute burn.
all this can be easily solved if he tells us how much he waters. im not trying to argue just trying not to "employ poor diagnostics"
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fair enough , i was harsh myself , its possible but a long shot

wow 50F ? well there you go , it seems both i and kid canabiss was wrong - seems like a combo of poor soil/low temps. it doesnt matter whos right , as both diagnosis is caused by the soil, just change ur soil and warm ur babies up
 
Dont worry too much about them being tiny. I'm growing greenhouse Lemon Skunk and at three weeks mine were that small. Later they just took off. Whenever my plants start getting the funny colors and I cant determine whats wrong I always flush them with purified H2o and for some reason they turn themselves aroung. One other thing. Dont water just a little. Completely saturate the container then leave em alone. Every 5-7 days works well for me. If you wait too long the plant will droop. Just add water and VOILA. just a little water quite often is something I used to do... bad habit to get into!
 
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