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Remove any mallow weeds in the surrounding area , as this weed can be infected by the same rust and serve as a source of inoculum . Mix 4 to 6 inches of acid peat into the top 6 to 8 inches of soil . Weeds such as dandelions , plantain , and thistle are also susceptible and can serve as a source of inoculum in home gardens . Remove individual flowers as they fade by cutting them off behind the stem swelling at the base of each bloom . Dandelions and plantain are also susceptible and can serve as sources of the disease in home gardens . Finish by covering with chicken wire to hold everything in place . Pack the soil firmly around the roots , then mulch the planting with 2 to 4 inches of sawdust , peat moss , or chopped straw . Dig the holes large enough to accommodate all the roots and deep enough so you can cover the uppermost roots with 3 to 4 inches of soil . At planting time you should also provide two to four inches of an organic mulch such as wood chips , pine needles , or compost . As discussed in more detail below , to measure surface displacement to this precision requires a relatively accurate a priori estimate of topography in the region and information on the position and orientation of the antennas during each image acquisition .