This is the 13806th most frequent Turkish word.
laleleri
"Leleleri" means "the tulips" in Turkish.
Here, 'laleleri' refers to tulips as the direct object of the sentence, marked by the accusative suffix '-leri' to indicate it's being seen.
Bahçede kırmızı laleleri gördüm.
I saw red tulips in the garden.
In this sentence, 'laleleri' again takes the accusative form since it is the direct object of the verb 'to water' (sulamayı).
Laleleri sulamayı unutma.
Don't forget to water the tulips.
'Laleleri' is used as the object in a description of an action, 'watching,' taking the accusative case to indicate it's the focus of the sight.