Yes, backyard landscaping and total-home landscaping add value to your home. According to the American Society of Landscape Architects (ASLA), high-quality landscape design has a 20 to 30 percent return on investment. So, when it comes time to sell your home, having a beautiful backyard landscaping oasis will increase your home’s value. 

If shade is a priority for you, then panting elm trees is a fine choice. A full mature elm tree has enough aesthetic appeal for some folks that it could add value to your home. 

That said, never plant elm trees too close to your home, sewer line, or sidewalks, as their roots can damage these, which can lead to costly repairs.

Unless it only rains once in a blue moon where you live, you’re going to want water-loving plants in your garden bed or pot. A few ideas for plants that aren’t super fast-growing (meaning they’re good in pots or near foundations) and can handle a lot of standing water include: 

• Acorus (Sweet flag)

• Colocasia esculenta (Taro or elephant ear): In many climates, these are annuals, making them less desirable because you need to adjust the chain again after each replant.

• Equisetum scirpoides (Dwarf horsetail rush): non-dwarf varieties of horsetail are fast growers and can take over quickly.

• Juncus effusus (Curly rush)

• Osmunda regalis (Royal fern): Royal fern can grow quickly but can also handle being crowded, making them good container plants.

The best size rock for your landscaping depends on the design, as different boulders serve different purposes. If you want to group boulders to create a natural-looking cluster, you’ll need a range of sizes. Otherwise, here are some suggestions:

• Small boulders (smaller than 12 inches across): Best for landscape edging and fire pits 

• Medium boulders (12–24 inches): Best for retaining walls and water features

• Large boulders (more than 24 inches): Best as standalone landscaping features, steps, or walkways.

Of course, you can mix and match sizes to create a unique display.