Sure, here are some romantic bedroom decor ideas with a plant theme:

Hanging plants: Hanging plants are a great way to add a touch of greenery to your bedroom without taking up too much space. They can be hung from the ceiling, from a wall, or from a plant stand.

Plant shelves: Plant shelves are a great way to display your plants and add some personality to your bedroom. You can choose from a variety of styles and sizes to fit your space.

Terrariums: Terrariums are a beautiful and low-maintenance way to add plants to your bedroom. They can be placed on a windowsill, a nightstand, or even on the floor.

Succulents: Succulents are a great choice for bedrooms because they are low-maintenance and can thrive in low-light conditions. They come in a variety of shapes and sizes, so you can find the perfect ones to fit your style.

Air plants: Air plants are another great choice for bedrooms because they don't need to be planted in soil. They can be mounted on a wall or a piece of driftwood, or they can simply be placed on a shelf or table.

Fiddle-leaf fig tree: The fiddle-leaf fig tree is a popular choice for bedrooms because it is a large, leafy plant that can add a touch of elegance to the space. It does require some sunlight, so make sure to place it near a window.

Pothos plant: The pothos plant is another popular choice for bedrooms because it is easy to care for and can thrive in low-light conditions. It comes in a variety of varieties, so you can find the perfect one to fit your style.

Snake plant: The snake plant is a low-maintenance plant that is also known for its air-purifying properties. It is a good choice for bedrooms because it can help to improve the air quality.

Peace lily: The peace lily is a beautiful and easy-to-care-for plant that is known for its white flowers. It is a good choice for bedrooms because it can help to remove toxins from the air.

When choosing plants for your bedroom, it is important to consider the amount of sunlight the room gets, as well as your personal preferences. You also want to make sure that the plants you choose are non-toxic, so that they are safe for you and your pets. I hope these ideas help you to create a romantic and inviting bedroom with a plant theme.