Final answer:
The question seems to be a mix-up, as the provided texts do not contain information about lilac bushes at Randy Cullers and his wife's new home. Lilac bushes may need specific adaptation to thrive, which might be the missing information needed.
Step-by-step explanation:
The student appears to be asking about the missing information regarding the lilac bushes at Randy Cullers and his wife's new home, a delightful setting with splendid roses and ivy, and the sedate charm of Old World architecture and landscaping. However, the provided texts do not mention any direct information about lilac bushes in relation to the new home, perhaps indicating a context mix-up or a missing piece of the literature. In the context of gardening, lilacs may require specific adaptation to the local climate and soil conditions to thrive, as suggested by the disappointment in the small size of branches and blossoms when purchased from a nursery and planted in one's own backyard.