Megachurch pastor Rick Warren is home recovering after his eyes were burned as he pruned a firestick plant in his yard, his spokesman told CNN Thursday.

Warren was hospitalized Monday after the incident and released Tuesday, said his spokesman, A. Larry Ross. Warren is expected to make a full recovery, Ross said.

"My eyes were severely burned by a toxic poison," Warren wrote in a Twitter message Thursday morning. "Hospitalized Mon. Excruciating pain. Now home. Pray my sight loss is restored."

Though the pain was initially so intense that Warren could not open his eyes on Monday, he was seeing well enough Thursday to send the Tweet himself, Ross said. "The pain was excruciating - 12 on a scale of 1 through 10," Ross said. "It's now down to an 8."

Warren was pruning shrubs in the yard of his Southern California home when he wiped his eyes after picking up leaves from a firestick plant, Ross said.

The sap of the firestick is toxic and can cause skin irritation and temporary blindness if it comes in contact with the skin or eyes, according to the website gardenguides.com. The firestick is a succulent with spiky orange branches.

Warren is currently on leave from his church, called Saddleback, to write a book, so the injury is not expected to affect his public schedule, Ross said.

"A doctor put protective contacts on my corneas as bandages during the healing," Warren said in another Tweet on Thursday. "I am NOT blind."

The firestick is found around the world, Ross said, and grows well in Southern California.

"Pastor Rick, an avid gardener, purchased it locally himself," Ross said.