About this item Choose a sunny location: Yellow Mexican Sunflowers require full sun to grow, so choose a location that receives at least 6-8 hours of direct sunlight each day. Prepare the soil: The soil should be well-draining and fertile. Add compost or aged manure to the soil and work it in to improve the soil structure. Sow the seeds: Plant the seeds about 1/4 inch deep in the soil, spacing them about 2 feet apart. Water gently to settle the soil around the seeds. Water regularly: Keep the soil evenly moist but not waterlogged. Water deeply once or twice a week, depending on the weather and soil conditions. Thin the seedlings: Once the seedlings have sprouted and are about 3 inches tall, thin them to one plant every 2 feet.
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