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Here are some photos of frost damage, (and no damage,) following 6 days and nights of below 10F.

The sustained cold with a slight breeze in very dry ground was different than previous cold years. We only got above freezing for about 4 hours every day for about 10 days and were below 20F from about 6 pm to 9 am.
 Heuchera maxima, Island Alum Root showing the cold (and drought). - grid24_12
Several of the perennials that are under the cover of trees felt pretty badly about the cold.
The frozen leaves of Snowberry. The plant is hardy, but the leaves didn't go deciduous as they froze in place. - grid24_12
Many of the leaves froze on the bushes and trees.
These Ceanothi survived the last cold when we got down to 7F, but this one was just too long.
None of the manzanitas showed frost burn. A few showed death by drought.
Morro Manzanita, Arctostaphylos morroensis seemed not to be fazed by cold no drought. - grid24_12
Morro Manzanita didn't feel the cold or frost.
Again, the Manznaitas like Sunset manzanita, which has coastal parents and higher rainfall didn't suffer much from the cold. In the drought is suffered somewhat. - grid24_12
Sunset manzanita felt some drought but not the frost.
In December of 1990 we had cold in the -F range and the Rhuses froze to the ground. Even with the exteneded cold this time it was only 8 and ten for a week and it didn't bother the Rhus ovata, the flower buds are still intact. - grid24_12
Both Sugar Bush and Lemonade Berry didn't feel the drought nor the frost.
None of the buckwheats in the ground seemed to be bothered by the cold. The Santa Cruz Buckwheat in the pots got nailed but I guess we had to many anyway. - grid24_12
Most of the Buckwheats did fine.
The leaves on many of the trees froze in place.
We've never had much problems with Ceanothus Concha and the cold. This time is and Ceanothus Ray Hartman got nailed. - grid24_12
Ceanothus Concha has always been a very stable plant here, but the cold got to it this time.
Arctostaphylos Brother James had a little tip burn. - grid24_12
We had a little tip burn on the Arctostaphylos Brother James.
For decades folks tell us how harsh their site is. Well even the desert seems to easier than this place. Here's Arctostaphylos rainbowensis under drought stress. The cold didn't seem to bother it much, but the 2 inches of rainfall for the year sure did. - grid24_12
The Arctostaphylos rainbowensis really felt the drought and the cold.
Dr. Hurd manzanita seems to be a garden plant. In our garden where we treat it like a native plant, it sucks. - grid24_12
Dr. Hurd manzanita seems to be good for coastal gardens. Not so hot in interior droughty gardens.
Arctostaphylos patula grows from about Big Bear up through Tahoe. You'd think the drought would do a number on it, but it seems fine and the cold didn't bother it. - grid24_12
Green Leaf manzanita felt the cold and drought a little.
Arctostaphylos Harmony has shown drought stress but no cold damage. Nice looking plant in spite of the drought and cold. - grid24_12
Arctostaphylos Harmony felt the drought but did fine in the cold.
Ceanothus Mills Glory and most of the other holly leaf Ceanothus types (Subgenus Cerastes) didn't seem to bothered by the drought no frost. - grid24_12
Most of the holly leaf types of Ceanothus did fine.
Ceanothus Joyce Coulter was beat up by the drought and killed by the frost. Again, it seems the dry conditions made the cold damage worse as the 1990 frost was much colder but in moist conditions and the Ceanothus wasn't damaged. - grid24_12
Many of the northern Ceanothus hated the drought and the cold.
Ceanothus spinosus has done surprisingly well in the drought and the cold. I've seen it in wet springy spots along the coast, why does it have drought and cold tolerance? - grid24_12
But some of the Southern Ceanothus did fine. Maybe the ability to survive the drought stress helped protect plants liked Ceanothus spinosus.
Ceanothus oliganthus is another of the plants that did very well. It tolerated the drought very well and the cold did't faze it. - grid24_12
Ceanothus oliganthus did fine under the drought stress and cold.
Blue Corgi manzanita is one we're playing with. Folks seem to like the small size and foliage. The cold and drought didn't seem to bother it. - grid24_12
Blue Corgi manzanita is one we're playing with. Folks seem to like the small size and foliage. The cold and drought didn't seem to bother it.
Paradise manzanita was having real trouble with the drought, and then the cold nailed it. - grid24_12
Paradise manzanita was having real trouble with the drought, and then the cold nailed it.
Ceanothus Snowball has do ok in the drought and did weel in the cold. Ceanothus Frosty Blue hated both. The cold killed one of the Frosty Blues. - grid24_12
More cold Ceanothus.
Most of the Ramona Manzaitas showed little damage from the drought and the cold. - grid24_12
Romona Manzanita has done well in the drought and frost.
La Panza Manzanita did fine in the cold and the drought. - grid24_12
La Panza Manzanita did fine in the cold and the drought.
Baby bear seems to be pretty cold hardy and drought tolerant. - grid24_12
Baby bear seems to be pretty cold hardy and drought tolerant.
I have no idea how this Arctostaphylos uvas-ursi San Bruno has survived the drought(it is in a dry drainage ditch) and the cold. - grid24_12
I have no idea how this Arctostaphylos uvas-ursi San Bruno has survived the drought(it is in a dry drainage ditch) and the cold.
The flowers got frozen off of Arctostaphylos John Dourley. - grid24_12
The flowers got frozen off of Arctostaphylos John Dourley.
Ceanothus thrysiflorus repens got the leaves frozen off of it. - grid24_12
Ceanothus thrysiflorus repens got the leaves frozen off of it.
Considering  Xylococcus bicolor, Mission Manzanita grows down in San Diego it handled the frost better well. - grid24_12
Considering Xylococcus bicolor, Mission Manzanita grows down in San Diego it handled the frost better well.
Some of the Pigeon Point did fine. - grid24_12
Some of the Pigeon Point did fine.
Even when we went below zero F in the past the Pigeon Point didn't burn from cold. This time it froze the top off of all the container stock and the plants in the ground. It appears the dry conditions really contributed to the damage. - grid24_12
Some of the Pigeon Point did not do well.
 Pickeringia montana, Chaparral Pea doing very well after the drought and frost. AND the deer haven't bothered it. - grid24_12
Pickeringia montana, Chaparral Pea doing very well after the drought and frost. AND the deer haven't bothered it.
A Fremontia Pacific Sunset next to a Ceanothus tomentosus after the frost. The Ceanothus is fried, the Fremontia is fine. - grid24_12
A Fremontia Pacific Sunset next to a Ceanothus tomentosus after the frost. The Ceanothus is fried, the Fremontia is fine.
The Santa Cruz Buckwheat did fine in the ground, the pots got beat up though. - grid24_12
The Santa Cruz Buckwheat did fine in the ground, the pots got beat up though.
The Ribes viburnifolium burnt in the pots and a little in the ground, but it looks to survive. - grid24_12
The Ribes viburnifolium burnt in the pots and a little in the ground, but it looks to survive.
Ribes speciosum is amazing, coming back from summer dormancy like nothing is happening. - grid24_12
Ribes speciosum is amazing, coming back from summer dormancy like nothing is happening.
The front of the main building gets very cold, and hot. This Ceanothus Remote Blue has been there for about 15 years and done fine until this year. When we first moved out here in the late 70's I tried to grow an orange tree in this spot. Managed to keep it alive for a few years, but one year I covered it and put a sprinkler on it, made a 8 ft. cube of ice and it died. - grid24_12
The front of the main building gets very cold, and hot. This Ceanothus Remote Blue has been there for about 15 years and done fine until this year.
This 10-12 year old Salvia gracias will go summer deciduous under the drought, but we've have .2 on an inch of rain last month and it came back. Frost didn't bother it. - grid24_12
This 10-12 year old Salvia gracias will go summer deciduous under the drought, but we've have .2 on an inch of rain last month and it came back. Frost didn't bother it.
Purple Sage seems to be very drought tolerant and hardy. - grid24_12
Purple Sage seems to be very drought tolerant and hardy.
Juniperus california seems to very at home with low rainfall and cold. - grid24_12
Juniperus californica seems to very at home with low rainfall and cold.
Purshia glandulosa has done well in the drought and frost. - grid24_12
Purshia glandulosa has done well in the drought and frost.
 Nolina bigelovii, Beargrass did fine. We've lost it before to cold wet soil. - grid24_12
Nolina bigelovii, Beargrass dfd fine. We've lost it before to cold wet soil.
Mahonia nevinii seems to be very cold hardy and drought tolerant. - grid24_12
Mahonia nevinii seems to be very cold hardy and drought tolerant.
Our 34 year old Ceanothus Ray Hartman really got hit by the drought and frost.
Ceanothus verrucosus has done very well in the dry cold.This Ceanothus is about 30 ft. from the Ceanothus Ray Hartman that got killed.
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Edited on Dec 31, 2013. Authors:
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