In Zone 8 you can plant canna, amaryllis, spider lily, montbretia and queen of the Nile. Keep in mind queen of the Nile has a very hard time with summer heat in Zones 9-10.
In Zones 9-10 you can keep planting rain lilly, crinum, callas and dahlia.
Ocotillos can be planted this month. Be patient! An ocotillo can take a long time to develop a good root system once transplanted. It can take 18-24 months before a single leaf will appear.
Care:
Zones 9-10 freesias can be left in the ground through the summer but keep them dry. It's not a bad idea to apply 3 inches of mulch to bulb beds in general this time of year to keep the soil moist.
Try not to prune your bulbs too much this time of year, only prune them if the dried leaves pull off in your hand.
Keep an eye out for mealybugs around succulents. These are tiny white sticky bugs that form like crystals in the crevices of your plants. Spray them with a burst of water or rubbing alcohol, then rinse off.
Watering:
Continue to water bulbs and perennials when the soil is dry.
Water new succulents about once a week (maybe 10 days) this month.
Fertilize:
Iris should be fertilized while they are still blooming.