Snake plant (Dracaena trifasciata)
It's near indestructible, able to survive temperatures of 5C to 27C, low and bright light, and infrequent watering. It's also one of the few succulents that is happy in high and low humidity.
Aspidistra is quite literally the Tony Stark of all plants. Native to eastern and southeastern Asia, this cast-iron super-plant is nearly indestructible and can handle reasonable neglect.
Most plants grow best in temperatures ranging from 59°–86°F. When temperatures above 90°F are sustained for long periods, plant growth is slowed, and some plants begin to show signs of stress.
In times of extreme heat, 1-2 times each week may be necessary. Know your plants though! Some plants prefer almost zero water during summer (manzanita, Ceanothus, madrone and cistus) and others wilt even when they have ample water (hydrangea, rhododendron). So adjust watering accordingly.
The time needed to recover from stress is proportional to the severity of the damage. Plant heat stress recovery may take months for crops that have been ignored for too long during a heatwave; in extreme cases, it may be impossible to bring them back to life.
Most plants shut down during extreme heat, so if it is over 100 degrees, it may be best to wait to water even if your plant is stressed. Throw a damp sheet over it, or mist it lightly to bring the temperature down. Mist leaves with a spray nozzle to cool down plant and reduce transpiration.
When you're looking for full sun flowers for pots, consider summer snapdragons, lantana, mandevilla vines and portulaca. This planter of full sun flowers includes 'Akila Lavender Shades' osteospermums (also known as African or Cape Daisies), 'Cool Wave Frost' spreading pansies and 'Clear Crystal' white alyssum.
Generally, hostas prefer to be out of direct sunlight. Most will tolerate morning sun, but need shade during the hottest part of the day. They are often planted beneath trees, but don't like competition from shallow-rooted trees.
Many seeds will not germinate at all if the soil gets too hot. During periods of extreme heat, one option is to start these seeds indoors under lights, and then transplant them into the garden after hardening them off (gradually adjusting the plants to direct sunlight and wind).
Don't Water at Mid-Day in the Sun. "Don't Water Your Plants in the Middle of the Day!" How many times have you heard that? "Only water your plants in the early mornings or late evenings." THE CHALLENGE: That's easy to say, but not always easy to do.
Avoid Overwatering Tomatoes in Summer Weather
Tomato plants need an inch or two of water a week, and a deep soaking is better than a little water every day.
What time of day should you water your lawn during extreme sun and heat? “Irrigate early in the morning whenever possible,” Goatley said. “Irrigating during the heat of the day is considered to be very inefficient as evaporation rates are typically highest during this time of day.
Watering plants in 100-degree heat must be done daily, especially if the soil has no ground cover.
Adding a layer of mulch around ground covers, shrubs, and trees will keep the soil a couple of degrees cooler while stopping it from drying out. Apply your mulch about three inches thick around the plants, spreading it near the drip line or water source. Ensure to keep it about six inches away from tree trunks.
So, how hot IS too hot for plants? The general answer is around 90 degrees F, with some exceptions to the rule.
Baobab Tree
They are known for being practically indestructible, capable of surviving brutal temperatures, fire and drought – and if the bark is stripped off, it grows back.
What is the secret of the immortal plant that survives in the desert? That would be Welwitschia, a two-leafed plant that grows in parts of the Namib Desert in southern Africa and can live for more than 1,000 years.