The examined substrates containing composts
made of municipal sewage sludge and either
straw (SSRS) or leaves (SSL) significantly affected
height and diameter of pelargonium plants and
the number of shoots (Table 3). Height of ‘Survivor
Hot Pink’ pelargoniums growing in the substrate
2, containing SSRS compost and peat (1:3),
was similar to the control plants. The greatest
plant diameter in this cultivar was observed in the
substrate 2. Pelargoniums grown in the substrate
3 had a smaller number of shoots and did not differ
in this respect from the plants grown in the
media containing SSL compost (substrate 4 and
5). ‘Graffiti Fire’ pelargoniums were the highest
when grown in peat (substrate 1) and in the media
containing SSRS or SSL compost mixed with
peat at 1:3 ratio.