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Yes, you can put topsoil over sand to encourage grass growth. The topsoil will help to improve water retention and promote grass roots’ development, making it a recommended step of the seeding process. Adding a layer of topsoil will provide additional nutrients to the sandy soil, helping the grass grow and remain healthy through many seasons.

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.

Grass is the most popular and safest option for planting over a septic drain field, but you can also plant small flowering plants and other lightweight plants that don’t have woody or deep roots. Avoid trees and bushes within 10 feet of the field, as the woody roots can crack the perforated pipes. You should also avoid planting vegetable or fruit gardens over your drain field, as a leak from the pipes could contaminate the soil and put anyone who eats the produce at risk.

A window flower box should be deep enough that there’s room for a wide selection of plants and the required amount of soil and gravel. Standard flower boxes are 8 inches deep and 8 inches from front to back. Larger is better to increase the variety of plants in the box, but you could run into stability issues as it increases in weight.