If you are looking for a tough plant it's hard to beat lantana.
Award Winner
Heat Tolerant
Drought Tolerant
Attracts: 
Birds
Butterflies
Hummingbirds
Characteristics
Plant Type: 
Annual
Height Category: 
Medium
Garden Height: 
20 - 30 Inches
Spacing: 
18 - 24 Inches
Spread: 
20 - 30 Inches
Flower Colors: 
Pink
Flower Shade: 
Shades of Fuchsia to Orange and Yellow
Foliage Colors: 
Green
Foliage Shade: 
Dark Green
Habit: 
Mounded
Container Role: 
Filler
Plant Needs
Light Requirement: 
Sun
Maintenance Category: 
Easy
Bloom Time: 
Planting To Frost
Hardiness Zones: 
9a, 9b, 10a, 10b, 11a, 11b
Water Category: 
Average
Soil Fertility Requirement: 
Average Soil
Uses: 
Container
Uses: 
Landscape
Uses: 
Mass Planting
Uses Notes: 
Great in landscapes and containers.
Maintenance Notes: 
Lantana are heat tolerant, use little to no supplemental water in the landscape, will tolerate less than ideal soils and usually don't need to be deadheaded. If you are looking for a plant that will thrive on neglect, lantana is the champ. Lantana come in many shapes, sizes and habits. Check size and habit information for the specific variety you are choosing to make sure it fits your needs. Lantana can be trimmed back at anytime to shape or to promote increased branching.