Pumpkin

Pumpkin need at least 2×2 meter territory.
It can be inter-planted with:

Leafy greens
Lettuce, spinach, arugula, Swiss chard, mustard greens

Herbs
Dill, basil, cilantro, parsley, mint

Root and onion crops
Garlic, onion, spring onion, radish

Legumes
Bush beans, peas

Flowers
Marigold, calendula, nasturtium