flower: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/flower - from package: python-flower

You may install the required package with command apt-get install {package}

Error in other languages:
flower: bevel nie gevind nie
flower: comandă negăsită
flower: comando não encontrado
flower: commande introuvable
flower: command not found
flower: käsku ei ole
flower: không tìm thấy lệnh
flower: komanda nerasta
flower: Kommando nicht gefunden.
flower: kommandot finns inte
flower: komut yok
flower: nie znaleziono polecenia
flower: níor aimsíodh an t-ordú
flower: no se encontró la orden
flower: no s'ha trobat l'ordre
flower: opdracht niet gevonden
flower: parancs nem található
flower: perintah tidak ditemukan
flower: príkaz nenájdený
flower: příkaz nenalezen
flower: команда не найдена
flower: командата не е открита
flower: 命令找不到
flower: コマンドが見つかりません