During the research, it was assessed how water extracts from Galium aparine and Matricaria maritima subsp. inodora affect the germination energy and capacity, as well as the length of the seedling root and the first leaf of the Dankowskie Zlote cultivar of Secale cereale and of the Janko cultivar of Triticale rimpaui. The experiment was conducted under laboratory conditions, with the use of Petri dishes. The influence of three concentrations of water extracts prepared from the dry and fresh mass of the plant’s above-ground parts was examined. Petri dishes watered with distilled water constituted the control treatment. Water extracts prepared from the Matricaria maritima subsp. inodora dry and fresh mass and Galium aparine fresh mass reduced the germination capacity and energy of rye and triticale in direct proportion to the increase of concentration. Higher concentrations of water extracts reduced, to a significantly larger extent, the growth of the seedling roots of both species. Lowest-concentration water extracts from the Matricaria maritima subsp. inodora dry and fresh mass and from the Galium aparine fresh mass stimulated the growth of seedling root of the cereals under study. Higher concentrations of water extracts prepared from the Galium aparine and the Matricaria maritima subsp. inodora dry mass reduced, to a significantly larger extent, the growth of the first leaf.

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