What content do you need on your gardener business website? The short answer is information that helps a potential customer learn whatever they need to know to decide to contact you for your services or products.
Some of the common web pages are a home page, about, services/products, contact and a portfolio/past work. These are the minimal but think about what information you look for when you are trying to decide on whether to contact someone about a service or product. There is no such thing as too much information on your website because different people are looking for different things.