Page.xaml

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:Controls="clr-namespace:MyGarden.Controls"
             mc:Ignorable="d"
             x:Class="MyGarden.Paginas.Home"
             NavigationPage.HasNavigationBar="False">
  <ContentPage.Content>
    <Frame Padding="0" CornerRadius="10" BackgroundColor="#d5d5d8" Margin="10, 5,10,20">
      <Controls:XEntry Placeholder="Busque suas plantas" PlaceholderColor="#9f9fa6" TextColor="#02C39A"/>
    </Frame>
  </ContentPage.Content>
</ContentPage>