You own a plant nursery and landscaping business. You have always hated business paperwork and do not like written contracts, so you usually use oral agreements. One agreement you have is to sell someone a large palm tree for $850. Another agreement is to provide two years' worth of monthly lawn mowing at a customer's home in exchange for an immediate payment of $1,800. Finally, you have an oral agreement to sell an exotic houseplant to one of your customers for $400 to be delivered by the end of this month, delivery included. Which of these oral contracts (if any) will be enforceable in court, and which ones (if any) will not be enforceable? Explain your reasoning.