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The description for Spike Growth says:

The ground in a 20-foot radius centered on a point within range twists and sprouts hard spikes and thorns. The area becomes difficult terrain for the duration. When a creature moves into or within the area, it takes 2d4 piercing damage for every 5 feet it travels.

The transformation of the ground is camouflaged to look natural. Any creature that can't see the area at the time the spell is cast must make a Wisdom (Perception) check against your spell save DC to recognize the terrain as hazardous before entering it.

Say I cast spike growth at the top of stairs that descend 10 feet. Would the spike growth go down the stairs and onto the floor at the bottom, or would it only affect the top floor only?

The description for Spike Growth says:

The ground in a 20-foot-radius Sphere centered on a point within range sprouts hard spikes and thorns. The area becomes Difficult Terrain for the duration. When a creature moves into or within the area, it takes 2d4 Piercing damage for every 5 feet it travels.

The transformation of the ground is camouflaged to look natural. Any creature that can’t see the area when the spell is cast must take a Search action and succeed on a Wisdom (Perception or Survival) check against your spell save DC to recognize the terrain as hazardous before entering it.

Say I cast spike growth at the top of stairs that descend 10 feet. Would the spike growth go down the stairs and onto the floor at the bottom, or would it only affect the top floor only?

The description for Spike Growth says:

The ground in a 20-foot radius centered on a point within range twists and sprouts hard spikes and thorns. The area becomes difficult terrain for the duration. When a creature moves into or within the area, it takes 2d4 piercing damage for every 5 feet it travels.

The transformation of the ground is camouflaged to look natural. Any creature that can't see the area at the time the spell is cast must make a Wisdom (Perception) check against your spell save DC to recognize the terrain as hazardous before entering it.

Say I cast spike growth at the top of the stairs thats only 10ft tall. Would the spike growth go down the stairs and into the floor on the bottom, or would it only affect the top floor only?

The description for Spike Growth says:

The ground in a 20-foot radius centered on a point within range twists and sprouts hard spikes and thorns. The area becomes difficult terrain for the duration. When a creature moves into or within the area, it takes 2d4 piercing damage for every 5 feet it travels.

The transformation of the ground is camouflaged to look natural. Any creature that can't see the area at the time the spell is cast must make a Wisdom (Perception) check against your spell save DC to recognize the terrain as hazardous before entering it.

Say I cast spike growth at the top of stairs that descend 10 feet. Would the spike growth go down the stairs and onto the floor at the bottom, or would it only affect the top floor only?

The ground in a 20-foot radius centered on a point within range twists and sprouts hard spikes and thorns. The area becomes difficult terrain for the duration. When a creature moves into or within the area, it takes 2d4 piercing damage for every 5 feet it travels.

The transformation of the ground is camouflaged to look natural. Any creature that can't see the area at the time the spell is cast must make a Wisdom (Perception) check against your spell save DC to recognize the terrain as hazardous before entering it.

Say I cast spike growth at the top of the stairs thats only 10ft tall. Would the spike growth go down the stairs and into the floor on the bottom, or would it only affect the top floor only?

The description for Spike Growth says:

The ground in a 20-foot radius centered on a point within range twists and sprouts hard spikes and thorns. The area becomes difficult terrain for the duration. When a creature moves into or within the area, it takes 2d4 piercing damage for every 5 feet it travels.

The transformation of the ground is camouflaged to look natural. Any creature that can't see the area at the time the spell is cast must make a Wisdom (Perception) check against your spell save DC to recognize the terrain as hazardous before entering it.

Say I cast spike growth at the top of the stairs thats only 10ft tall. Would the spike growth go down the stairs and into the floor on the bottom, or would it only affect the top floor only?