How to plant on a slope

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Growing Vegetables on a Back Yard Hill | Home Guides | SF Gate

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Just space the plants so that they have enough room to spread and grow. Just know they will spread "downhill" as they grow.

You should be able to plant anything you want. If you are trying to cover a lot of area on a hill, things like melons, cucumbers and squash will cover a large area with their vining. Just make sure you have ways to get to your plants to care for them and harvest them. You could also make rows flat by doing the areas where the plants are planted with stacking rocks, pavers concrete blocks, etc. and leave the rest of the hill side as is.

really depends on how steep the slopes is and making sure all the top stuff gets enough water. If you have the resources and the capability.. I would make an effort to at least partially terrace the slope. It can be as simple as a long 2x6, or2x 8-2x12 depending on how deep you want or need your terraces to be. Heavy metal re-bar (the heavier the better) cut into 18 inch + stakes to hold up the 2Xs .... one every 3 feet or so... they can be secured to the wood with conduit clamps. The ends can be plugged with a large rock or a cinder block*(s) Fill your terraces with good garden soil and plant away. the terraces will make even watering easier. You could put trellis' at the very top for tomatoes, cucumbers, squash and melons (GardenersSupply.com has some great ones to check out )

*fyi... the holes in cinder blocks, filled with dirt, are a great way to plant onions, garlic, radishes, strawberries (keeps the berries out of the dirt)... anything that has a non spreading root system and will fit in the hole.

https://www.gardeningknowhow.com/special/slope-hill/growing-vegtable-garden-hill.htm