What are two ways agriscientists can change when plants grow?

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So one way a agriscientist can change or affect the development of a plant is it's fertilizer, another is it's environment or surrounding which could be dependent on its previous known adaptations such as if it has this adaptation in the past will it be able to adapt to this surrounding

There are many plants that can withstand the cold, but in particular icy places with heavy snow and sleet, I feel like genetic modification would have higher chances of success in making a fortitudinous plant. 2. Agriscientists are actively working on adapting plants to different hardiness zones.