My intention is to provide a profile of plants which are fully hardy in the north east of Scotland,which of course means they will be hardy in all parts of the country. However there are several which borderline the hardy agenda, which to a certain extent we have still had a degree of success.
For instance Agapanthus, although hardy,our Summers here in Aberdeen tend to fizzle out before the plants reach flowering stage. Good results can still be obtained if grown in containers.
Agapanthus all have strap like leaves with tall flower spikes which open mid/late Summer . The hardiest are fully deciduous, the evergreen are a bit more tender. Those which are fully deciduous, after placing in the unheated greenhouse in late Autumn should not be watered until early spring, as the roots tend to rot, evergreen varieties should be lightly watered in winter.
Plant your Agapanthus in a reasonable sized container in April using John Innes No.3 compost mixed with a peat based general garden compost, good drainage is essential, place your container in a sunny position, it may not flower profusely in the first season.
Do not start the feeding regime until next season. In the first season,around late October place your container grown Agapanthus in the unheated greenhouse if it is the deciduous type, cut back the decaying leaves. Wrapping the plant pot in bubble wrap will give added protection,of course don’t wrap the surface of the pot with the bubble wrap.Start watering in March take care not to overdo it, give a general liquid feed in early/mid April. Place your plant in a sunny spot in the second week of May, feed with a tomato liquid fertilizer which will encourage flower bud development, repeat the tomato feeding in June.
I find that if Agapanthus is left in the greenhouse until after late May they will not flower as well.
Agapanthus come in shades of pale blue right through to a dark rich blue, others of a pure white. Bressingham Blue is one of the dependable fully deciduous varieties, with tall dark blue flowers, very impressive.
Position – Full sun
Height – 60/90cm
Soil – Make a mix of John Innes No.3 and general garden compost.