Deep, Stable Planters/Flower Pots 15" or more in height: (Kingsmead)

Having grown some 'Honesty' seedlings with sentimental value, there's no garden to give them the depth they clearly need. Would very much appreciate some deep stable pots with drainage to give them the loving conditions they are asking for whilst they enjoy the little outdoor platform they now inhabit.
And - bonus! the kind donor will certainly be offered a seedling if they so wish...