Why does GetMethod("ToString") return null?

I am currently learning C# Generics and reflection. I want to call a method "toString" of a generic class T. The problem is that my program crashes with a null point exception - "nameMethod" variable below is null and I cannot figure out why "t.GetMethod("toString");" call below returns null. This is my code:

public class ViewModel<T> where T: EntityBase
{

    public ViewModel()
    {
        T _model = Activator.CreateInstance<T>();
        Type t = typeof(T);
        MethodInfo nameMethod = t.GetMethod("ToString");

        Console.WriteLine(nameMethod.Invoke(_model, null));
    }
}

BasePlant class:

public class BasePlant : EntityBase
{
    public string GetName => "TESTING NAME METHOD";

    public override string ToString()
    {
        return GetName;
    }
}

Usage:

 static void Main(string[] args)
    {
        var vm = new ViewModel<BasePlant>();

        Console.ReadKey();
    }

I am stuck at this crash and I am not sure what I am doing wrong. I would appreciate any help.