Annuals which are easiest to grow are:

The choice of marigold and zinnia as the easiest annuals to grow is well-founded due to their resilience and adaptability. Both plants thrive in a variety of soil types, can withstand drought conditions once established, and are tolerant of different light conditions, including full sun. This flexibility makes them ideal for novice gardeners as well as those looking for low-maintenance options.

Marigolds are particularly known for their pest-repelling properties, making them not only beautiful but also beneficial to surrounding plants. Zinnias, on the other hand, produce vibrant blooms and encourage a diverse ecosystem, attracting pollinators like bees and butterflies.

In contrast, the other combinations of plants listed may require more specific growing conditions or care. For example, sweet peas can be more challenging due to their need for cooler temperatures and support as climbing plants, whereas pansies often require more attention regarding watering and protection from extreme heat. Similarly, primroses typically thrive in cooler climates and shade, which limits their versatility compared to marigolds and zinnias. Therefore, the combination of marigold and zinnia stands out as the most accessible option for successful gardening.