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- Author or Editor: F. R. Gouin x
Early spring flowering of Forsythia × intermedia Zab. (forsythia) and growth of Cydonia sinensis Thouin (Chinese quince) can be prevented by over-wintering container grown plants under microfoam thermo-blankets covered with black, white, or clear polyethylene (poly) spray painted in late winter and diluted white latex paint. Although covering microfoam with black poly may extend its useful life and suppress the growth of winter weeds, it appears damaging to X Cupressocyparis leylandii A. J. Jacks & Dallin. (Leyland cypress) and Prunus laurocerasus L. (cherry laurel). Ilex crenata Thunb. (Japanese holly), Viburnum rhytidophyllum Hemsl. (leathe leaf viburnum) and Euonymous alata Thunb. ‘Compacta’ (dwarf winged euony-mus) responded equally well to all treatments. Thermo-blankets protected the roots from minimum killing temperatures but highest maximum temperatures were measured under polyethylene foam and microfoam covered with clear or woven clear polyethylene.
Tagetes erecta L. cv. Golden Jubilee, Zinnia elegans Jacq. cv. Fire Cracker, and Petunia hybrida Hort. cv. Sugar Plum were grown in various sludge compost-based media based on fraction size. Growth determined by shoot dry weight was greatest in media containing greater portions of small compost particles. No nutrient deficiency symptoms or toxicity symptoms were observed. Shoot weight was increased by addition of a N-P-K fertilizer.
Ilex crenata Thumb. (Japanese holly), Buxus sempervirens L. (American boxwood), Prunus laurocerasus L. (cherry laurel) and Cotoneaster congestus Bak. (dense cotoneaster) plants overwintered under the microfoam thermo-blanket survived the winter of 1976-77 better and grew larger the following growing season than plants stored unprotected or overwintered in shall shelters covered with white poly. Irrigating plants at 3 week intervals in shelters during winter storage did not improve plant survival. Plants stored unprotected suffered the greatest amount of winter injury. Soil temperatures under the microfoam thermo-blanket were consistently higher during the coldest part of winter than in all other treatments. Air temperatures under the thermo-blanket fluctuated the least initially until mid-February, but began to fluctuate more as days grew longer and ambient air temperature increased in late winter.