The Solid Hedge

The "solid hedge," with its "loops of bramble" and thorns symbolizes a barrier (1). It acts as a "Do Not Disturb Sign" that the speaker refuses to heed. She braves the thorns and is rewarded with a room of her own inside the patch.

Raspberries

Raspberries symbolize resilience and the balance between sweetness and pain. The speaker does not describe feasting on the berries themselves, but rather relishing the sanctuary provided by the patch.

Rooms

Rooms symbolize both the physical and metaphorical spaces that humans inhabit. For instance, the real world of adulthood is full of rooms "too big and full / of worry to comfortably inhabit" (6-7). The Raspberry Room, on the other hand, is a place of refuge and rest for the speaker.