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Kathleen Ferguson grabbed a pair of pruning shears from a mailbox nailed to a garden bed and leaned down to cut bunches of Orlaya grandiflora on the flower-filled hillside.

Too thick a layer of oak or Magnolia grandiflora leaves, both slow to break down, can smother small herbaceous plants.

‘South Africa’ is a vigorous grandiflora that has wonderfully scented golden-yellow flowers with a high-centered bloom form.

The list includes Marshallia grandiflora, a large flowing plant from the American Southeast that was declared its own species this past year.

At least, that’s what happened to Marshallia grandiflora, a large flowering plant last collected in 1919.