Possible Clues:

• Growing feature of avenue? Earth perhaps and endless grass
• Common city plant
• Growth of scheme to be French and English
• Earth, say, on English sycamore
• During exercises, learnt about energy and growth
• Sounds like Holly is used to flying on shady roads in France
• Debts regularly seen to support scheme with regard to energy growth
• E.g. earth bank cut back forming feature of city park
• Sounds like vanilla with cherry - typically ordered along the road entering a French town
• What one hopes leaves on time, leaves on it