A new and distinct cultivar of Mandevilla plant named ‘LVDIP1807’, characterized by its relatively compact, upright to outwardly spreading plant habit; moderately vigorous to vigorous growth habit; early and freely flowering habit; single bright pink-colored flowers; and good container performance.

A new and distinct cultivar of Mandevilla plant named ‘LVDIP1816’, characterized by its upright to outwardly spreading and semi-trailing plant habit; moderately vigorous to vigorous growth habit; early and freely flowering habit; single bright red-colored flowers; and good container performance.

A new and distinct cultivar of Mandevilla plant named ‘LVDIP1805’, characterized by its relatively compact, upright to outwardly spreading plant habit; moderately vigorous to vigorous growth habit; early and freely flowering habit; single deep red-colored flowers; and good container performance.

A new and distinct cultivar of Mandevilla plant named ‘Sunpa 201’, characterized by its upright to outwardly spreading plant habit; vigorous growth habit; freely branching habit; early and freely flowering habit; long flowering period; and medium-sized speckled red and light purplish pink bi-colored flowers with light purplish pink-colored petal margins.

A new and distinct cultivar of Mandevilla plant named ‘QD18’, characterized by its compact and broadly upright plant habit; moderately vigorous growth habit; freely branching habit; dense and bushy appearance; dark green-colored leaves; freely flowering habit; and relatively large white-colored flowers with yellow-colored throats that are held upright above the foliar plane.

A new and distinct cultivar of Mandevilla plant named ‘QD20’, characterized by its compact and broadly upright plant habit; moderately vigorous growth habit; freely branching habit; dense and bushy appearance; dark green-colored leaves; freely flowering habit; and relatively large strong red-colored flowers with orangish red-colored throats that are held upright above the foliar plane.

A new and distinct cultivar of Mandevilla plant named ‘Sunpa 6173’, characterized by its upright plant habit; vigorous growth habit; freely branching habit; early and freely flowering habit; long flowering period; and medium-sized red-colored flowers with orangish yellow-colored centers.

A new and distinct cultivar of Mandevilla plant named ‘Sunpa 0931’, characterized by its upright to outwardly spreading plant habit; vigorous growth habit; freely branching habit; early and freely flowering habit; long flowering period; and medium-sized yellow-colored flowers with orange-colored centers.

A new and distinct Amsonia plant named ‘String Theory’ characterized by winter-hardy, compact, densely-stemmed, clean habit with linear, dark-green foliage that goes dormant in the winter; single, light periwinkle-blue, star-shaped flowers on medium height scapes flowering above the foliage beginning about early-May and effective for about four weeks. The new plant is useful in the landscape as a specimen or en masse and also as a cut flower.

A new and distinct Amsonia plant named ‘String Theory’ characterized by winter-hardy, compact, densely-stemmed, clean habit with linear, dark-green foliage that goes dormant in the winter; single, light periwinkle-blue, star-shaped flowers on medium height scapes flowering above the foliage beginning about early-May and effective for about four weeks. The new plant is useful in the landscape as a specimen or en masse and also as a cut flower.