In "The Listeners" by Walter de la Mare, which words or phrases tell us that the plants around that house have overgrown?

In "The Listeners" by Walter de La Mare, there are a number of words and phrases that create an image of overgrown flora around the empty house.
In the third and fourth line of the poem, the speaker notes that "And his horse in the silence champed the grasses/ Of the forest’s ferny floor." These two lines in the first stanza create an image of high grass and a dense forest floor in which a horse can contently graze right next to the house.
In the tenth line of the poem, as the image is being created of high, densely-growing grasses next to the house, the speaker claims that "No head from the leaf-fringed sill/Leaned over and looked into his grey eyes". The windows are being overtaken by plants, as well as the outside lawn area.
In the 23rd and 24th lines, the speaker describes how no-one answered his knocking "While his horse moved, cropping the dark turf/’Neath the starred and leafy sky." His horse is cutting down the height of the tall grass beneath trees that have grown so dense that it is difficult to see the sky clearly.