Beginner Gardening: HELP! I NEED YOUR ADVICE ON MY CUCUMBER PLANTS, 3 by Lyndsay3228

Lyndsay3228 wrote:
I have a raised veggie garden with great soil. I planted my cucumber seeds very close together (along a 20' row backed with a 6' trellis for vertical growth. I did thin them, but they looked great so I only thinned them to approx. 4-6inches apart. They still appear to be healthy...although some are way ahead of others (different varieties mind you). Should I be fertilizing with my miracle grow for tomatoes (18-18-21)? ALSO, should I thin further apart or will they produce the maximum? As well, I sowed the same variety in a large container (75% black earth 25% well rotted manure)...the container plants are double if not triple the size of those planted in my raised bed. Why would this be?
I LOOK FORWARD TO ADVICE FROM A MORE EXPERIENCED GREEN THUMBER