Did you know that the names of the berries in Russian are only used in singular number? Some names of vegetables and fruit are only used in singular, too.
Клубника (strawberries), малина (rasberries), черника (blueberries), смородина (current), земляника (wild strawberries), рябина (rowanberries), etc.
Also used in singular: капуста (cabbages), виноград (grapes), морковь (carrots), картофель (картошка, potatoes), чеснок (garlics), лук (onions), etc.
На столе лежала клубника. There were some strawberries on the table. Correct, singular.
На столе лежали клубники. There were some strawberries on the table. Incorrect, plural.