Phlox '21st Century Blue' F1

Luscious, velvety indigo purple annual phlox which was still in flower in my greenhouse on Christmas day last year. Incredibly hard to beat. More
5 seedlings 190287-5 £6.50

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Luscious, velvety indigo purple annual phlox which was still in flower in my greenhouse on Christmas day last year. Incredibly hard to beat.

Genus Phlox
Variety 21st Century Blue F1
Type Tender Perennial (grown as a Half-Hardy Annual)
Border Position Front
Soil Type Fertile, Neutral
Scent Unscented
Site Full Sun, Part Shade
Moisture Moist but Well-drained
Height 25cm (10in)
Spacing 20-25cm (8-10in)
Sowing, Seeds, Planting March-April
Care Tips Deadhead to prolong flowering. Phlox grow well indoors or in shady positions. This is an ideal plant for a container pot. Keep the soil moist.
Flowering July - first frosts, or 10-12 weeks after sowing.
Vase Life These should last up to a week in water.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  • Sow Under Cover/Plant Indoors
  • Direct Sow/Plant Outdoors
  • Flowers/Harvest

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Phlox '21st Century Blue' F1 reviews

* * * * * Average based on 7 reviews

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Reviewed 27th June 2018 by Alison Ellis

One of my favourites this year and will buy next year. A glorious purple colour, I planted them with lime petunias in a pot. Strong growth and plenty of flowers.


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Reviewed 21st July 2017 by Kerry Holden

Looking absolutely magnificent in pots and flowering for all they are worth. One has got a bit straggly so might trying getting back and see if that promotes new growth and flowers.

Great display

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Reviewed 18th July 2016 by Enid Richmond

I planted these with lime green nicotiana in a large urn and they look amazing. It pays to dead head them regularly.

Superb shower of colour

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Reviewed 8th June 2016 by Jenni Elliot

All but one of the plugs blooming are blooming marvellously. Colour is wonderful & they're full of blooms. Can be a bit brittle but even when some parts of the plant broke off, more leaves & flowers appeared. Bought as part of purple pot collection & also extra plugs & would definitely buy again & recommend. They're fabulous & give the border a real shower of intense colour & the pots look superb too.

Fantastic front of border plants

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Reviewed 3rd October 2015 by Patricia Minns

Grew this little plant from seed this spring and whilst I agree that the germination was poor, the two plants which were planted out in the front of the border have been fantastic all summer. Needing no dead-heading or attention apart from the very occasional drop of water in my thin and chalky soil they have bloomed non-stop and show no sign of stopping. Will definitely grow these next year. I also have loads of snails and they have not been troubled.

Phlox '21st Century Blue'

* * * * *

Reviewed 3rd August 2014 by Andrew Blount

Didn't find it easy to germinate, and the few precious seedlings were irresistible to snails. But the sole survivor is an absolute star among the patio pots: will certainly have another go next year.


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Reviewed 12th July 2014 by Gill

These are the most amazing bluey/purpley colour you've ever seen and are brilliantly short so they can populate the tricky area at the front of the border. Would recommend to anyone who is planning a blue border as they really will astound.

Sadly, the plugs I got were a bit broken on arrival as they are quite brittle plants. However they'd started to rally and looked like they were going to fulfill their potential when they then got snaffled by (we think) a mouse or other rodent. :o( However, the ones I grew from seed were healthy & strong so withstood the worst of the mousey attentions.

Would therefore personally recommend growing them yourself if you have the facility rather than getting plugs.