The genus 'pachycereus' comprises large and hardy cacti native to arid regions. Generally, they require full sun exposure, low to moderate water, and well-draining soil. Optimum growth occurs at temperatures between 70-100°F. Common challenges include mealy bugs, root rot due to overwatering, and sunburn if acclimatization to full sun is not gradual. Seasonally, pachycereus species need lesser water in winter but are tolerant of occasional frosts. In summer, watering should be ramped up gradually while still avoiding waterlogging.