Rhododendron liliiflorum callus forming during air layering. Photo: Marc Gilbert.

Rhododendron liliiflorum callus forming during air layering. Photo: Marc Gilbert.

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The glasshouse renovation works being undertaken at the Royal Botanic Garden Edinburgh (RBGE) as part of the Edinburgh Biomes Project (2020–2027) pose a number of challenges to the horticulturists managing the plant collections. The grandeur of many of the larger specimens and the limit of available space are the most prominent of these. Air layeri...

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... shoot. If using plastic sheeting to cover the wounded area in place of an air layering pot, then sphagnum moss should be wrapped around the wounded shoot during wrapping to seal the area. Care should be taken not to overfill the pot with growing medium as it may become difficult to irrigate. Propagules will callus and root as cuttings would (Fig. 5), forming a mass of undifferentiated totipotent cells that can divide into other forms of plant tissue. Roots will then form from the ...