A beautiful plant and Proteas prefer a nice sandy loam or open soil. Some Proteas are less fussy and are quite happy in a heavier soil although they will not survive in heavy clay soils. If you do have heavy soils it will be necessary to first mound the soil to improve it and then dig in compost and gypsum to break up any residual clay.

A natural mulch such as bark, straw or leaves protect the plant's surface roots, retain moisture and keep weeds down. Pull out any weeds by hand and avoid using herbicides near Proteas.

Proteaflora plants are pretty tough once they're established. Water at least twice a week in the first summer, preferably daily when it's really hot. The soil around the root system should not be permitted to completely dry out when the plant is young. You can gradually reduce watering as the plant becomes established about 2 years after planting old. Then the watering frequency depends on the prevailing conditions and whether your variety is listed as drought tolerant. Thank you @ctrl-alt-nwo

http://www.proteaflora.com.au/establishing-your-new-protea.html