What is the easiest outdoor potted plant to keep alive?
Rosemary and lavender are great beginner plants for full/mostly sun because they are very drought tolerant. They can also be found for pretty cheap. Most standard potting soils will do. Weekly watering is usually more than sufficient. Keep in mind that lavender can get quite large and will require pruning. Lavender is perhaps the most archetypal plant for dry soils but plenty of others such as buddleia, choisya, geranium and verbena are good choices too.
What plant can survive the longest without water?
ZZ plant, Aloe vera, snake plant, any cactus or Euphorbia sp, jade plant (the leaves will be slightly shriveled, but will bounce right back when water resumes, which is exactly what they evolved to do), just name a few. Most succulents, in general, can go long periods of time without water. Succulents encompass a vast array of plants that store water in their leaves, stems, or roots, making them highly adapted to dry conditions. From echeverias and aeoniums to haworthias and crassulas, succulents offer a wide variety of shapes, sizes, and colors.Succulents can typically survive several weeks to months without water, depending on the type and environment. In cooler conditions, some can go up to 3 months, but in hot weather, they may need water every 1-2 weeks. Succulents like Aloe can survive longer without water than those like Haworthia.