'Dark Knight' has the deepest blue colour of any Caryopteris that we know. Its tidy, upright growth habit and profusion of flower spikes on silvery green foliage make it an essential part of the summer.
Prefers full sun, or partial shade with free-draining, but moist soil or compost.
An ideal shrub for patio container and can be planted into the border in autumn for further enjoyment.
Height x Spread / Trail:
60 x 50 cm
July - September
A hardy plant which should survive normal winter conditions outside, especially if protected from the hardest frosts.
Recommended Pot Sizes:
Leave enough room so that foliage does not overlap within crop time.
Typical time required from pot to sale:
30 weeks over Winter
10 weeks in Spring / Summer
Requires Pinching / Cutting Back
Based on producing a finished pot size of 1L for plug products and 2L for liner products. (*)
Growing Media / Irrigation / Water Capacity:
Free draining - keep evenly moist
Feeding / Fertilser
(during crop time):
NPK balanced feeding
Requires normal/regular feeding (Standard EC)
Standard 5.0 to 5.5
Growth Regulation PGR:
Due to the current approval situation, please contact your PGR provider
Temperature During Production:
Cool crop 4 -12°C
Temperature During Transport:
Available for Delivery:
January - August
Recommended Sales Window:
February - November
Please note: this forecasted availability is a guide only. Quantities can be increased or produced earlier on request.
Additional Notes (*):
All information provided is based on producing a default finished pot size of 1L for our plug products, and 2L for 7cm and 9cm liner products. For alternative pot sizes please adjust cultural notes accordingly.
Finishing times - Based on average estimated climatic and environmental conditions, and are for guidance purposes only.
Temperature – These conditions assume a protected ornamental growing environment. Recommended growing is generally above 5°C.
Feeding – Does not specify controlled release or liquid fertiliser application. This choice will depend on your conditions, requirements and preferences – please contact your fertiliser consultant for suitable products to meet your requirements.
Growing media and pH – Is shown for guidance purposes only - please contact your growing media consultant for suitable growing media to meet your requirements.
This information is for guidance purposes only and is based upon our own growing environment and experience during trials. It is wise to use your own knowledge about your growing conditions and local environment in order to make informed cultural decisions.