About 2-3 whole bulbs
1 clove = 1/2 tsp, so 3 cloves = 1 1/2 tsp
one tea spoon
That would depend on how big the cloves are, - they do not grow in a "standard" size.
I have done this before, and found that whole cloves vary in size. Some cloves can be twice the size of their companions; so, this is not easy to answer. Does your recipe require that you grind the cloves? If so, then you should grind enough to occupy 2 teaspoons. I realize fresh spices are a good practice to follow, but cloves are a strong spice; and, I have found that my guests generally can't distinguish cloves from an unopened bottle of ground cloves versus the fresh-ground originals.
If one teaspoon of whole cloves is approximately equivalent to 0.75 teaspoons of ground cloves, then 0.50 teaspoons of whole cloves is equivalent to 0.375 teaspoons of ground cloves. If you do not have ground cloves, then a substitute to use is ground allspice.
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As a general rule you would use one half as much of a ground spice in a dish as opposed to the whole spice. But take care even the reduced amount of a ground spice may color your food a whole lot more than the whole spice would. I have turned gravy green with to much ground rosemary.
Garlic comes in a bulb which can then be divided into segments. These are known cloves...so 10 cloves of garlic would be 10 segments of garlic - probably just under 2 bulbs worth
2 cloves of garlic may be equal to 1/2 tablespoons.
where to buy dryed cloves
4 cloves