In my opinion, the shade mesh is not needed in the balcony. They must not get sun all day where they are at, maybe over the summer is the chance for these trees to make up for the light deficiencies during the rest of the year. When I've tried to grow trees while leaving in apartments, my main problem has always been making sure the trees get enough light, not shading them from it. They look like they are well drained, just make sure you water them enough, letting the soil dry in between watering.