This grower is sure of this plant identification.
the smaller pot size is the native meadow cranes bill ( as shown in the photo) the plants in 2 litre pots are of the painters pallet series, flowers range from white through pink to pale blue
Meadow cranesbill, Meadow geranium
Geranium pratense (Meadow cranesbill). This species has an upright form, the flowers will range in colour from bright pink to dark blue with some red veining. They will tolerates soils which are alkaline and will do best planted in full sun in moist, well drained, rich soil. This plant is often found in the wild in Northern Europe.
They are fully to half hardy. Most species will prefer sun, but some do better in the shade. They will grow in any but waterlogged soil. Outdoors, grow larger species and hybrids in any moderately fertile, well-drained soil. Grow small species and hybrids in humus-rich, sharply drained soil in full sun. Under glass, grow half hardy species in loam-based potting compost with added sharp sand, in bright filtered light. During the growing season, water freely and apply a balanced liquid fertilizer monthly. Water sparingly in winter.
Ground cover, border, edging, rock garden, meadow.