A comparison of variegated comfrey types (this post will be edited with updates periodically)

The following three variegated forms of comfrey all have this in common; the portions of their leaves lacking in chlorophyll are sensitive to sunburn if they do not have constant access to moisture during the summer and so will likely be best grown in very moist soil or in a location sheltered from direct mid-day sun during summer.  Additionally, none of these selections appear to have virally induced variegation, but rather appear to be a chimera variegation in that they contain a mix of both normal and albino tissue variously distributed through their above ground parts.

Symphytum ×uplandicum 'Axminster Gold' 

I'm not sure the origin of this clone, but appears to be the only available variegated clone of Russian comfrey at this time.  The green portions of the foliage have a slight haze giving them an attractively silvery haze.  I don't see this in green leaf forms of comfrey so I suspect it may be possible that the surface cell layer is lacking chlorophyll even in areas of the leaf that appear green due to chlorophyll present in lower layers of the leaf.  'Axminster Gold' can not be propagated true to type via root cuttings as the roots to not appear to contain the variegated tissue.  Any resulting plants from root cuttings will simply be green leaved.  To propagate true to type there are two methods.  Clumps can be divided, keeping only pieces with existing growing points from the crown.  This is ideal for potted specimens as dividing an in ground specimen will result in fragmented roots which can resprout solid green growth points which can distract from or outcompete the desirable variegated growth.  Alternatively, lower portions of flowering stems can be cut and rooted to produce true to type plants without disturbing the established parent plant.

Symphytum officinale "Copycat" ("Copycat" is the working name for now, but has not yet officially been released)

Appears quite similar to 'Axminster Gold' on account of having the same variegation pattern, but appears to have arisen as a sport (first spotted in 2023) in a large patch of common comfrey.  When dug up it did appear to be growing from what may have been an older root which had at some point become severed from surrounding roots.  For this reason I don't believe it to be a unique seedling but rather a vegetive sport (mutation) from a neighboring plant.  Despite similar appearance it should be genetically distinct from 'Axminster Gold' which is generally listed as a hybrid Russian comfrey clone.   

The chimeral variegation of this clone can only be reproduced via propagation from above ground plant parts such as rooted flower stems, severed growth points or division of clumps, though the latter is discouraged for in ground plantings as any severed roots left in the soil (unavoidable) will regenerate normal green, non-variegated growth points.

Symphytum officinale "Pinto" ("Pinto" is the working name for now, but has not yet been officially released)

This mottled "pinto" type variegation appears to be unique as I have not found documentation of any known forms bearing this pattern type prior to this.  This plant was found amid a large colony of common comfrey, but when dug up there was no sign that it was a sport as it had no root connection to surrounding plants and had a rather young looking root overall.  I had observed the presence of this plant since the year prior to when I dug it up for further evaluation and believe it most likely originated as a seedling rather than a from a mutation growing off a severed root from another nearby plant. 
Regarding propagation from root cuttings: I took a root cutting from this plant with the hope that it might grow true, but with the expectation it would revert to solid green like root cuttings of 'Axminster''s Gold'.  Surprisingly the multiple growth points which have resulted so far from the root cutting have been fully albino so it appears that it may only be reliably propagated from crown division or by rooting cuttings from flower stems.  A positive side effect would be that this variety might be suitable for planting in locations with root disturbance because it would not result in accidental propagation via fragmented roots (assuming the root cuttings all eventually fizzle out and die after sprouting foliage devoid of chlorophyll).

Are you interested in growing variegated comfrey too?

I currently offer 'Axminster Gold' comfrey for sale via my nursery (link here).  

If after further evaluation the "copycat" and "pinto" selections end up proving stable enough for release and you would like to be notified, please send me a message here.