Time filter

Source Type

Akoumianaki-Ioannidou A.,Laboratory of Floriculture and Landscape Architecture | Papagianni M.,Laboratory of Floriculture and Landscape Architecture | Fasseas C.,Agricultural University of Athens
Acta Horticulturae | Year: 2010

Elaeagnus ×ebbingei (Elaeagnaceae), is an evergreen shrub, with particular ornamental properties and characteristics. The plant has particularly decorative leaves, scented flowers that bloom in autumn and it is easily adapted to a broad range of temperatures and soils. In this work the seasonality of its propagation by stem cuttings with the use of rooting hormone, some anatomical features were examined with the fluorescent microscope and the possible use of the plant as ornamental in urban and sub-urban areas are discussed. Apical stem cuttings were planted in a peat/perlite mixture 1:1 v/v in trays and watered by mist after treating them with IBA rooting hormone at concentrations of 0, 3000 and 4000 ppm. Cuttings were collected in September and November 2004 and in January, April and June of 2005 in order to establish the best season for taking cuttings. The rate of success of rooting and the qualitative characteristics of the rooted cuttings (dry and fresh weight) were investigated for each sampling season. The results showed that the most suitable time for taken cuttings is autumn and summer. Cuttings taken in autumn had the highest rate of rooting (73.3±6.7%) irrespective of hormone concentration. The rooting hormone has a significant effect on rooting irrespective of season. Concentration of 3000 ppm has the highest effect on rooting. The morphological and anatomical leaf features, thick cuticle, dense mesophyll and presence of peltate trichomes, indicated that this plant is particularly suitable for use as an ornamental in urban and suburban areas as it can withstand drought and atmospheric pollutants.

Akoumianaki-Ioannidou A.,Laboratory of Floriculture and Landscape Architecture | Alexiou P.,Laboratory of Floriculture and Landscape Architecture | Fasseas C.,Agricultural University of Athens
Acta Horticulturae | Year: 2010

Pterocephalus perennis (Dipsacaceae) is an interesting species of low plantation (up to 15 cm high) native to Greece with grey-green leaves and many pink flowers arranged in inflorescences having a rich and extended blooming time in summer (June through August). In this work the possibility of its propagation by cuttings and possible use as ornamental were investigated. For this purpose cuttings were taken from six different naturally growing plants at three different periods and treated with IBA, at concentrations of 0, 2000 and 3000 ppm. The cuttings were planted in a peat/perlite mixture 1:1 v/v in pallets and watered by mist in order to investigate the seasonality of rooting. The morphology and anatomy of its leaves were also investigated with light and scanning electron microscopy. The results showed that P. perennis is easily propagated by cuttings, without the use of IBA. The highest rate of rooting success was observed in cuttings without IBA planted at spring (90%) where the rate of success was 55.5% for autumn and 39.6% for summer planted cuttings. The leaves of P. perennis are amphistomatic with mesophytic anatomical characteristics. Many glandular and non-glandular trichomes cover both sides of the leaves and leaf petioles which render the plant more resistant to biotic and abiotic factors. The anatomy of Pterocephalus perennis, its appearance, and its ability to grow in variable environments make it particularly suitable for commercial uses as an ornamental for landscaping, for covering slopes to retain soil as well as a houseplant in pots, roofs and rock gardens.

Papafotiou M.,Agricultural University of Athens | Papafotiou M.,Laboratory of Floriculture and Landscape Architecture | Kanellou E.,Agricultural University of Athens | Kanellou E.,Laboratory of Floriculture and Landscape Architecture | And 2 more authors.
Acta Horticulturae | Year: 2010

In the archaeological site of Eleusis alternative methods for the control of natively grown weeds, shrubs and small trees were tested. The native and uncontrolled flora creates severe problems to the monument and the use of herbicides should be minimized in order to avoid additional deterioration of the monument. The methods tried out were selected according to the type of vegetation in each selected part of the monument. For weed control soil solarization was applied, which decreased by 80% the weed population the following winter and by 55% the next spring. In order to eliminate shrubs and small trees grown on the monument they were pruned down to the soil surface and a dense suspension of glyphosate (Round - Up) was spread on the sections or injected inside the cambium. Both methods of glyphosate application were 100% effective. A particular problem was that of olive tree seedlings grown on the monuments, by means of seed dispersal from olive trees that are part of the landscape of the site. Spraying the olive trees once with 400 mg l-1 naphthalinacetic acid (Apponon), at the end of May - early June resulted in complete fruit abortion. So, the method is suggested for olive tree spreading control in Mediterranean archaeological sites. To protect a mosaic floor at a Roman villa that is not yet restored and conserved, successive layers of quartz sand, matting which prevents root growth, LECA (light expanded clay aggregate) and gravel were applied. This way weed development was totally inhibited and the mosaic was protected from corrosion.

Discover hidden collaborations