Hardwood kitchen tools are easy to care for.  Do not put them in the dishwasher, or soak them overnight.  The smooth, hard surface makes hand-washing easy. When cooking with berries and beets, choose stainless steel. Rub in olive oil to moisturize the wood occasionally.  Mineral oil is a better choice for very hot, dry climates. If you wish to keep the handle silky smooth, do not wet
handle to wash it, simply scrub with olive oil and a thin towel
or steel wool instead. This is also an excellent way to revitalize your spoon should it ever need it.



Below follows a dreadful study about  food bacteria: 
Plastics V.S. Hardwoods



Bacteria

Authors: Ak, Nese O.1; Cliver, Dean O.2; Kaspari, Charles W.3

Source: Journal of Food Protection®, Volume 57, Number 1, January 1994 , pp. 16-22(7)

Publisher: International Association for Food Protection

Abstract:
The microbiology of plastic and wooden cutting boards was studied, regarding cross-contamination of foods in home kitchens. New and used plastic (four polymers plus hard rubber) and wood(nine hardwoods) cutting boards were cut into 5-cm squares("blocks"). Escherichia coli (two nonpathogenic strains plus type OI57:H7), Listeria innocua, L. monocytogenes, or Salmonella typhimurium was applied to the 25-cm2 block surface in nutrient broth or chicken juice and recovered by soaking the surface in nutrient broth or pressing the block onto nutrient agar, within 3-10 min or up to ca. 12 h later. Bacteria inoculated onto plastic blocks were readily recovered for minutes to hours and would multiply if held overnight. Recoveries from wooden blocks were generally less than those from plastic blocks, regardless of new or used status; differences increased with holding time. Clean wood blocks usually absorbed the inoculum completely within 3-10 min. If these fluids contained 103-104 CFU of bacteria likely to come from raw meat or poultry, the bacteria generally could not be recovered after entering the wood. If ≥106 CFU were applied, bacteria might be recovered from wood after 12 h at room temperature and high humidity, but numbers were reduced by at least 98%, and often more than 99.9%. Mineral oil treatment of the wood surface had little effect on the microbiological findings. These results do not support the often-heard assertion that plastic cutting boards are more sanitary than wood.

Document Type: Research article

Affiliations: 1: Food Research Institute (Department of Food Microbiology and Toxicology), World Health Organization Collaborating Centre on Food Virology, University of Wisconsin-Madison, Madison, Wisconsin 53706; Department of Food Science, World Health Organiz 2: Food Research Institute (Department of Food Microbiology and Toxicology), World Health Organization Collaborating Centre on Food Virology, University of Wisconsin-Madison, Madison, Wisconsin 53706; Department of Bacteriology, Department of Animal 3: Food Research Institute (Department of Food Microbiology and Toxicology), World Health Organization Collaborating Centre on Food Virology, University of Wisconsin-Madison, Madison, Wisconsin 53706