Tithonia, or Mexican sunflower, is definitely a sun lover. Give it a hot, sunny sight and it could easily reach heights of 5 - 8 ft. It may need some support or staking, especially in windy sites. You can direct sow seeds, after danger of frost, or start them indoors, 4 - 6 weeks before you set them out. Don't rush them. The seedlings can stunt if exposed to cold temperatures.