There's a thin line between fertilizing and overfertilizing your food crops. Too few nutrients and your tomatoes and corn never really take off. Too many and your artichoke and broccoli can suffer. Since I tend to favor deep-rooted perennials, which are low-maintenance and more resistant to weather extremes, my particular challenge is making sure I don't overdo it. So I use fertilizer strategically, boosting plant growth largely by feeding my soil. I test my soil every other year so I know the nutrients my soil needs. And I rely on timing, knowing the right mix of fertilizer, and the best sources.
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