rose is ruosa

ruosa = rose (noun) (some things Google found for "ruosa": an uncommon term; a rare last name; World of Warcraft gaming character name; RUOSA brand or ID of lighting fixtures; a rare first name; user names; means rose in Dalmatian; similar ruoša means "preparation, stocking up" in Lithuanian; similar ruoska means whip (noun) in Finnish)

Word derivation for "rose"
Basque = arrosa, Finnish = ruusu
Miresua = ruosa

In chapter 8 of Alice's Adventures in Wonderland, Alice sees three of the Queen of Hearts' gardeners painting white roses red.

daisy is pitxä

pitxä = daisy (noun) (some things Google found for "pitxa": an uncommon to rare term; user names; La pitxa is a pizza place in Caracas, Venezuela; similar pitxer means jar, pitcher, jug in Basque; pitxa may mean vase or jug in Catalan)

Word derivation for "daisy" :
Basque = bitxilore (bitxi (jewel, pretty) + lore (flower))
Finnish = päivänkakkara (päivän (day's) + kakkara (chrysanthemum))

The Finnish word for daisy has thirteen letters, and the Basque word has nine letters!? Oh, my. I don't particularly want a word for daisy with a minimum of eight letters! This is my conlang, so I'm bending the rules.

Both the Basque and Finnish words are compound words. As the last part of both words means flower, or a type of flower, I'm going to simply ignore that part. I don't see how I could make a Miresua compound word. So, I only mixed the first parts of the words.

*Amended* word derivation for "daisy" :
Basque = bitxi, Finnish = päivän
Miresua = pitxä

I considered making this word pätxi, but changed my mind when I learned that Patxi is the Basque form of the masculine first name Francis or Francisco.

This is a word from paragraph two of Alice's Adventures in Wonderland. Alice was considering making a daisy-chain.

leaf is hesti (revisited)

hesti = leaf (noun) (some things Google found for "hesti": an uncommon term: a feminine first name that can be Indonesian; user names; an unusual last name; datative case of "stallion or horse" in Faroese and "horse" in Icelandic; similar name Hestia is the Greek goddess of the hearth)

Word derivation for "leaf":
Basque = hosto, Finnish = lehti
Miresua = hesti

My previous Miresua conlang word for "leaf" was "helto".

grass is rohar

rohar = grass (noun) (some things Google found for "rohar": an uncommon term; a last name; Rohar's Roughnecks is a Guild Wars guild; user names; Rohar Trucking of Illinois; RoHar is an antigen; Phumi Rohar is a town in Cambodia)

Word derivation for "grass" :
Basque = belar, Finnish = ruoho
Miresua = rohar

flower is loku

loku = flower (noun) (some things Google found for "loku": an uncommon term; title of an online collection of really bad haiku; user names; "Eya Dan Loku Lamayek" is a 1975 movie from Sri Lanka; "Ka Ua Loku" is a Hawaiian song title; a last and first name from Sri Lanka; means "tall" in Sinhala (transliterated); "Loku and the Shark Attack" is a young adult book about a boy living in Papua New Guinea; a place in the Democratic Republic of the Congo)

Word derivation for "flower" :
Basque = lore, Finnish = kukka
Miresua = loku