(Image from: https://hudsonvalleyseed.com/products/new-zealand-spinach?_pos=1&_psq=new%20zealand&_ss=e&_v=1.0)

Growing Instructions for New Zealand Spinach:

Direct sow from mid-May to early July, or start indoors a bit earlier. Space at least 12 inches apart in the row: once New Zealand Spinach takes off, it spreads quickly. Plants flower and go to seed rather discreetly and will often pop up in your garden next year. Not too picky about conditions, but do provide a bit of compost.

(from Hudson Valley Seed Company website)