Russian, one day at a time

Some Russian words for fruits and vegetables that are collective, like English "bread." These don't have plurals except in special contexts, like when referring to more than one kind.

The suffix -ина is sometimes added to refer to a particular item. You can also use штука "item" to describe a counted number: пять штук вишин.

A diminutive suffix may also be added. See this post on learn_russian where some Russian speakers comment on how they use the diminutive with these collective nouns.

брусника cowberries
вишня cherries
горох peas
ежевика blackberries
земляника wild strawberries
капуста cabbage
картофель (m) potatoes
клубника cultivated strawberries
крыжовник gooseberries
лук onions
малина raspberries
морковь (f) carrots
красная смородина redcurrants
чёрная смородина blackcurrants