The problem with trying to grow Australian plants outside of Australia is that the soil there is deficient in phosphorus so the native plants have evolved ways to operate without it. When they encounter it they do not respond well. There are those that believe that one of the reasons that many Australian plants are relatively short-lived in our U.S. gardens is that eventually they overdose on the phosphorus in our soil. This is true of not just all Grevillea, but of all Australian plants. I have Loropetalum interplanted with Leucadendron, also Australian, but I have never, ever fertilized the Loropetalum (or anything, for that matter, except roses and citrus). Unless you have really poor soil you shouldn't need to fertilize most shrubs or trees. There are no tricks; just an understanding of each plant's native habitat and how you can best emulate it.

Not a good time of the day for photos, stuff is in either harsh light or shade. Grevillea "read" in the landscape as shrubby, so architectural plants like Agaves and Aloes and other succulents are good companions. Aloe flowers are in the same sunset (yellow orange pinky red) colors as Grevilleas, so that is a plus when both are in flower. Grevillea 'Moonlight' to the right of Aloe 'Hercules' and various Aloes & Agaves below. Feathery foliage of 'Ned Kelly' contrast with Agave and Aeonium Above is 'Robyn Gordon' with Salvia clevelandii, Limonium perezii, Hummannia fumariifolia, Leonotis, and an Aloe. Also have them planted with Leucospermum, Leucandendron, Protea, Maireana, Leucophyllum, various drier-climate Salvias, that sort of thing. They can get chlorotic in their first winter, so plant with a handful of soil sulfur.

Most Australians have epicormic buds so my guess is yes...but these plants are pretty short-lived. It might be easier just to get another one. Drainage is paramount with Grevillea; they like very well-draining poor soil (no phosophorus, little nitrogen. Never fertilize them. I would likely just replace it but you can certainly experiment and see what happens when you cut it back. I've had several dozen of these over the years and have gradually just replaced them with a longer-lived plant as they have gotten leggy or died.

Needing advice to see if I could plant a grafted Grevillea thyrsoides ontop of a beloved pet without repercussions of nutrients interfering