The trunks can dominate yard space and are even capable of pushing down retainer walls or fences. Homeowner set back $4,000 after retainer wall damagedWarren recently removed a Yucca tree from a property in Padstow, in Sydney's southwest. The homeowner is looking at a hefty bill — "upwards of $4,000" — after the retainer wall had to be completely replaced, he explained. Advertisement AdvertisementAdvertisement Advertisement"The tree was pushing over the retaining wall and was also pushing onto the neighbour's fence." The Mexican bean tree is also a highly-invasive species that authorities are urging Aussies to keep out of their garden.