I'm fairly sure one of the adjacent residents has planted this on the reserve area of the Hokitika beach-front.
Cucurbita maxima Duchesne, 1786
Apparently growing wild in a weedy area by small stream, near to gardens.
Vines, medium sized leaves, long vines, green squash(?)
vegetable gardens in waste ground around new tower blocks; with cabbage
Coyote melon (Cucurbita palmata). Growing wild in alluvial gravelly/sandy soil, climbing monzogranite boulder. Angiosperm of the squash family Cucurbitaceae. One yellow blossom starting to open.