Perovskia 'Blue Spire'
- Position: full sun
- Soil: well-drained, poor to moderately fertile
- Rate of growth: average
- Flowering period: August and September
- Hardiness: fully hardy
With its aromatic leaves and upright spikes of violet-blue flowers, Russian sage makes a wonderful companion to all kinds of late-summer ornamental grasses and perennials. In August and September, tiny, violet-blue, tubular flowers appear on silver-grey spikes above the main framework of the plant, among deeply-cut and lobed, grey-green leaves. This deciduous sub-shrub makes a real impact planted en masse alongside a path, where the sage-like fragrance of its leaves can be appreciated, or try it alongside other silver-leaved plants, or in swathes in a sunny border. One of our recommended plants, it copes well with dry, chalky soil and salt-laden air.
- Garden care: As this shrub has a tendancy to flop a little, in March cut back to the permanent framework of the shrub to promote bushier growth. After pruning apply a generous 5-7cm (2-3in) mulch of well-rotted garden compost or manure around the base of the plant.
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Q:I bought 3 of these from you earlier this year & am about to plant them out, but I'm not sure how to position them as I don't remember how big they growAsked on 28/4/2015 by Jax from United Kingdom
These plants have an eventual height of around 1.2m and spread of 1m.Answered on 15/5/2015 by Helen from crocus
Q:Hi, I have a 'Blue Spire' plant that is in need of help! It has 3 branches, each is bare for about 6 inches from the soil up, after that it's bushy, leafy and covered in flowers. Sadly, it looks ridiculous because of the naked bottom (so to speak). Is there anything I can do to encourage new branches from the base or is it a lost cause?Asked on 8/18/2014 by CB from Aberdeen
Perovskias do have the tendency to become leggy, so we recommend giving the a hard prune, each year in mid-spring, just as the new growth is starting to emerge. If you have not done this previously, then you should cut back all the stems to approximately 5 - 10cm above ground level. In subsequent years, you can then cut the stems back again to within 3 or 4 buds from the old wood.Answered on 8/27/2014 by helen from crocus
Q:Any reason why myplants are not flowering?
Hello. I have some plants that seem to be happy and growing well but aren't flowering- two Fuchsias, a Crambe cordiflora, and a Geranium 'Buxton's blue'. Even those that are flowering are a bit rubbish - a Perovskia 'Blue Spire' and some Verbena bonariensis have produced some flowers but not many. What can I do to improve flowering - is there a particular feed or fertiliser I should use? The soil is dense london clay, but the garden is not shady, but nor is it in full sun. It is quite sheltered. Many thanks, RobertAsked on 7/26/2009 by Robert Wilne
A:Hello There, There are a number of reasons why plants don't flower including too much shade, not enough water or nutrients, or pruning at the wrong time of the year. It can also be caused by the plant putting on new root growth instead of focusing its energies on producing flowers. I am not really sure why yours has not produced buds, but you can often give them a bit of a push by feeding with a high potash fertiliser. I hope this helps. Helen Plant DoctorAnswered on 7/27/2009 by Crocus Helpdesk
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