PLANT of the week
Erysimum ‘Jumbo Orange’
■ This is a lovely new introduction from Plant World Seeds, a small family firm in Devon. Every year its catalogue is a delightful collection of unusual seeds and this flamboyant wallflower caught my eye.
They have developed a perennial variety with fragrant bright orange flowers which open in late winter. Also of interest are the Dahlia Autumn Dazzlers, a new generation of tall elegant dahlias hybridized at Plant World.
These are hardy single forms, with the occasional dark leaf specimen, that will flower in a sunny spot from late summer until first frost. For more information, visit plant-world-seeds. com or phone them on 01803 872939. Recently you advised a reader to choose a clumpforming bamboo tree to cover her arbour. We have what must be that type – and it’s taking over.
It is starting to push up flagstones on our patio and is now also infringing on our neighbour’s garden. How do we go about resolving this issue? Thank you in anticipation. Margaret Treacy
Unfortunately, there’s no easy answer to this. Unless you remove the bamboo from the area beside the flagstones and insert a root barrier around the ‘mother plant’ the issue will continue. Some species have vigorous near-surface roots, and your bamboo is one of them.
Their vigorous growth can move terraces, decks and paths that are in their way! So, dig up
the extended parts of the plant, and use a thick black plastic vertical membrane to a depth of 60cm. This will allow you to control the original plant.
These barriers are ideal for controlling running rhizomes such as those of the Sasa, Sasaella and Pleioblastus species when space is limited.
Dig a track 58cm deep which will leave you with a 2cm section of the barrier protruding the surface when it’s fitted. Rhizomes occasionally creep over the surface so this small protrusion will stop them.
Place your barrier vertically into the track and backfill with soil as you go.
If you come upon any existing rhizomes when digging your track, just remove them. Be careful to remove any other rhizomes from outside the extent of your planned area if they have spread.
If you keep your bamboo within the barrier well fertilised and watered, it’s less likely to spread out in search of nutrients. Best wishes, Diarmuid
ROSA MUM Dear Diarmuid