The propagation of Persicaria capitata in different substrates for green roof use
Persicaria capitata is an herbaceous species from Asia cultivated widely throughout Brazil as an ornamental ground cover. As it is used in landscaping, it is fitting to evaluate plant propagation and handmade, local-sourced substrates for use in green roof landscapes. A glasshouse experiment was carried out over winter at the University of Passo Fundo in southern Brazil. We evaluated the rooting of cuttings of Persicaria capitata under mist irrigation in three different substrates: carbonized rice husk (CRH), a handmade mixture of mineral soil and organic compound (MS+OC) 1:1, and Humossolo®, with two different treatments, the presence or absence of inflorescences/leaves at the tip of each cutting. A randomized block design was used in a 3×2 bi-factorial plots with 4 replications. After 40 days, there were no differences in results between the substrates in terms of rooting percentage, although the presence of flowers on cuttings decreased survival, but did allow for natural reseeding (6.38 plantlets plot-1). The results demonstrate that Persicaria capitata can be propagated successfully by cuttings over winter in southern Brazil using different substrates and while the presence of inflorescences on cuttings did reduce success, this method did produce natural reseeding.
Petry, C., Scalon, F.M., Ventura, M.E., Dall'Agnese, L., Tedesco, C.D. and Garcia, N.B.U. (2016). The propagation of Persicaria capitata in different substrates for green roof use. Acta Hortic. 1108, 317-322
Persicaria capitata, cuttings, flowering, natural reseeding