Json Texture help

I'm trying to change size of the texture used to give the cactus in a flower pot have needles sticking of the sides, how would I get it to use more pixels in the texture?

{
"ambientocclusion": false,
"textures": {
"particle": "block/flower_pot",
"flowerpot": "block/flower_pot",
"flowerpotb": "block/flower_pot_bottom",
"dirt": "block/dirt",
"cactus": "block/cactus_potted"
},
"elements": [
{ "from": [ 5, 0, 5 ],
"to": [ 6, 6, 11 ],
"faces": {
"down": { "uv": [ 5, 5, 6, 11 ], "texture": "#flowerpotb", "cullface": "down" },
"up": { "uv": [ 5, 5, 6, 11 ], "texture": "#flowerpot" },
"north": { "uv": [ 10, 10, 11, 16 ], "texture": "#flowerpot" },
"south": { "uv": [ 5, 10, 6, 16 ], "texture": "#flowerpot" },
"west": { "uv": [ 5, 10, 11, 16 ], "texture": "#flowerpot" },
"east": { "uv": [ 5, 10, 11, 16 ], "texture": "#flowerpot" }
}
},
{ "from": [ 10, 0, 5 ],
"to": [ 11, 6, 11 ],
"faces": {
"down": { "uv": [ 10, 5, 11, 11 ], "texture": "#flowerpotb", "cullface": "down" },
"up": { "uv": [ 10, 5, 11, 11 ], "texture": "#flowerpot" },
"north": { "uv": [ 5, 10, 6, 16 ], "texture": "#flowerpot" },
"south": { "uv": [ 10, 10, 11, 16 ], "texture": "#flowerpot" },
"west": { "uv": [ 5, 10, 11, 16 ], "texture": "#flowerpot" },
"east": { "uv": [ 5, 10, 11, 16 ], "texture": "#flowerpot" }
}
},
{ "from": [ 6, 0, 5 ],
"to": [ 10, 6, 6 ],
"faces": {
"down": { "uv": [ 6, 10, 10, 11 ], "texture": "#flowerpotb", "cullface": "down" },
"up": { "uv": [ 6, 5, 10, 6 ], "texture": "#flowerpot" },
"north": { "uv": [ 6, 10, 10, 16 ], "texture": "#flowerpot" },
"south": { "uv": [ 6, 10, 10, 16 ], "texture": "#flowerpot" }
}
},
{ "from": [ 6, 0, 10 ],
"to": [ 10, 6, 11 ],
"faces": {
"down": { "uv": [ 6, 5, 10, 6 ], "texture": "#flowerpotb", "cullface": "down" },
"up": { "uv": [ 6, 10, 10, 11 ], "texture": "#flowerpot" },
"north": { "uv": [ 6, 10, 10, 16 ], "texture": "#flowerpot" },
"south": { "uv": [ 6, 10, 10, 16 ], "texture": "#flowerpot" }
}
},
{ "from": [ 6, 0, 6 ],
"to": [ 10, 4, 10 ],
"faces": {
"down": { "uv": [ 6, 6, 10, 10 ], "texture": "#flowerpotb", "cullface": "down" },
"up": { "uv": [ 6, 6, 10, 10 ], "texture": "#dirt" }
}
},
{ "from": [ 6, 4, 6 ],
"to": [ 10, 8, 10 ],
"faces": {
"north": { "uv": [ 6, 8, 10, 12 ], "texture": "#cactus" },
"south": { "uv": [ 6, 8, 10, 12 ], "texture": "#cactus" },
"west": { "uv": [ 6, 8, 10, 12 ], "texture": "#cactus" },
"east": { "uv": [ 6, 8, 10, 12 ], "texture": "#cactus" }
}
},
{ "from": [ 6, 8, 6 ],
"to": [ 10, 12, 10 ],
"faces": {
"north": { "uv": [ 6, 4, 10, 8 ], "texture": "#cactus" },
"south": { "uv": [ 6, 4, 10, 8 ], "texture": "#cactus" },
"west": { "uv": [ 6, 4, 10, 8 ], "texture": "#cactus" },
"east": { "uv": [ 6, 4, 10, 8 ], "texture": "#cactus" }
}
},
{ "from": [ 6, 12, 6 ],
"to": [ 10, 16, 10 ],
"faces": {
"up": { "uv": [ 6, 6, 10, 10 ], "texture": "#cactus" },
"north": { "uv": [ 6, 0, 10, 4 ], "texture": "#cactus" },
"south": { "uv": [ 6, 0, 10, 4 ], "texture": "#cactus" },
"west": { "uv": [ 6, 0, 10, 4 ], "texture": "#cactus" },
"east": { "uv": [ 6, 0, 10, 4 ], "texture": "#cactus" }
}
}
]
}