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Euphorbia polychroma
Pyrus calleryana 'Aristocrat' - Other than their unpleasant fragrance these trees are great.
Petunia 'Potunia Cappuccino' - Playing off the pink and yellow seems to be the best way to bring out the best in this new Petunia.
Centaurea montana 'Gold Bullion' - Not that attractive a plant when in flower or not, but the buds are amazing yellow with black details. Doesn't make up for its problems in all other areas.