The short answer is that it depends on the kit. Urban planter box kits do not follow one universal standard, so some kits include seeds, some include starter plants, some include both, and many include neither. The best way to know is to read the product listing carefully and check the “what’s included” section before buying.
Some urban planter box kits are designed as beginner-friendly growing kits. These often come with a planter box, liner, potting mix, drainage components, and a packet of seeds. Seed-based kits are usually cheaper to produce and ship, and they give you the experience of growing plants from the beginning. However, they require more patience and attention. You need to sow at the right time, keep moisture levels consistent, provide enough light, and wait for germination. The seed packet should tell you the variety, sowing depth, germination time, and sunlight needs. If the kit includes seeds, check whether they are suited to your climate and whether the planter box is large enough for the mature plants.
Other kits may come with starter plants, also called seedlings or transplants. These kits are often marketed toward people who want a faster visual result or who are less confident about germinating seeds. Starter plants can be useful on balconies, patios, and small urban spaces because they shorten the time to harvest or bloom. Still, live plants need careful handling. Check whether the seller ships at the right planting season, whether the plants arrive healthy, and whether the kit includes enough space for the roots to grow. Starter plants also need a period of adjustment after shipping, so follow any hardening-off or transplanting instructions.
Many urban planter box kits actually include neither seeds nor starter plants. Instead, they provide the container, soil, drainage system, trellis, or self-watering feature, and you choose the plants yourself. This can be a good option if you already know what you want to grow or if you prefer buying local seedlings. Just remember to budget for seeds, transplants, and extra soil or fertilizer.
Before buying any kit, ask three questions: What exactly is included? Is the kit designed for seeds or starter plants? And does the planter size, sunlight requirement, and watering system match your space? If you are a beginner, a kit with clear instructions and either quality seeds or healthy starter plants can save time. If the kit includes neither, treat it as a planter system rather than a complete garden. In short, urban planter box kits may come with seeds or starter plants, but you should always verify the contents instead of assuming.