brown leaf tips ..... the cause is either to much or too little water .... will have to be your own judge ..... ask yourself - when and how much you watered last ?
if its still too cool to be outside *full-time* - slack off watering
if its warm enough to be outside *full-time* - step up watering
dont water when its cool outside
seedling fertilizer -
I would repot each in its own pot ....while re-potting, layer in about a tablespoon of Osmocote 13-13-13 or 14-14-14 throughout the soil mix - so there is Osmocote from bottom to top
that should last over a year .... then - fertilize while watering - once very 14 days with Miracle-Gro water soluble all -purpose
the Osmocote will provide all the necessary NPK ...and the Miracle-Gro - that plus the trace /or/ Micronutrients
