To further the above comment, even though I probably shouldn't ... plants need nutrients, light and water. If you crowd them to a point where they are deprived the light, then you will definitely have issues. You cannot crowd them to the point of not having nutrients or water ... this is up to the gardener to provide (a crowded bed needs sufficient nutrients and water per plant not per area). There is also consideration to root growth, but if you are providing the water and nutrients in sufficient quantities, then the roots do not necessarily have to sprawl and dominate. It's a trade-off. Feed the plant, not the space. Light deprivation is a major consideration for not overcrowding too much though.
I welcome discussion to the contrary on this ... I am definitely not an expert and willing to listen to other opinions!
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