The only problem with decoration in a hog nosed tank, is they like to burrow, so anything you put in there, you should make sure it doesnt fall under burrowing and squish the snake.
I have a desert vivarium set up for my Bearded Dragon, on one side, I have a heat lamp, and a rock propped up against the side, so he can climb up and bask closer to the lamp. I have a small aloe vera plant in there, as I didnt want to use a cactus. Unfortunately, the plant looks like crap, cause he's chewed on it LOL, which you wont have with the snake.
Here is a list of toxic plants to reptiles:
http://www.peteducation.com/article....articleid=1612
Air plant
Amanita
Amaryllis
American yew
Andromeda
Arum lily
Australian flame tree
Autumn crocus
Avocado
Azalea
Balsam pear
Baneberry
Bird of paradise
Bishop's weed
Black laurel
Black locust
Bloodroot
Bluebonnet
Blue-green algae
Boxwood
Bracken fern
Broad beans
Broomcorn grass
Buckeye
Buckthorn
Bulb flowers
Burdock
Buttercup
Cacao
Caladium
Calla lily
Camel bush
Candelabra tree
Cardinal
Castor bean
Chalice vine
Cherry tree
Chinaberry tree
Christmas candle
Clematis
Cocklebur
Coffee
Coffee bean
Coral plant
Coriander
Corncockle
Cotton bush
Coyotillo
Cowslip
Crown of thorns
Cutleaf
Daffodil
Daphne
Datura
Deadly amanita
Death camus
Delphinium
Devil's ivy
Dieffenbachia
Dutchman's breeches
Eggplant Elderberry
Elephant's ear
English ivy
English yew
Ergot
Eucalyptus
Euonymus
False hellebore
False henbane
Felt plant
Firethorn
Flame tree
Four O'Clock
Foxglove
Ghostweed
Glottidium
Golden chain
Ground cherry
Heliotrope
Hemlock
Henbane
Holly
Honeysuckle
Horse bean
Horse chestnut
Horsetail reed
Hyacinth
Hydrangea
Indian licorice
Indian turnip
Inkberry
Iris
Jack-in-the-pulpit
Jasmine
Java bean
Jerusalem cherry
Jimsonweed
Johnson grass
Juniper
Kentucky coffee tree
Lantana
Larkspur
Laurel
Leucotho
Lily-of-the-valley
Lima bean
Lobelia
Locoweed
Lords and ladies
Lupine
Malanga
Mandrake
Marijuana
Maternity plant
Mayapple
Meadow saffron
Mescal bean
Mexican breadfruit
Mexican poppy
Milk vetch
Milkweed Mistletoe
Mock orange
Monkshood
Moonseed
Morning glory
Mountain laurel
Mushrooms
Narcissus
Navy bean
Nettles
Nightshades
Oak
Oleander
Panda plant
Parsley
Peires
Pencil tree
Periwinkle
Philodendrons
Pigweed
Pikeweed
Poinciana
Poinsettia
Poison ivy
Poison oak
Pokeweed
Potato
Precatory
Privet
Pyracantha
Rain tree
Ranunculus
Rape
Rattlebox
Rattlebush
Red maple
Rhododendrons
Rhubarb
Rosary peas
Sandbox tree
Scarlet runner
Skunk cabbage
Snowdrop
Snow on the mountain
Sorghum grass
Sorrel
Spindle tree
Spurges
Sudan grass
Sweet pea
Tansy ragwort
Thornapple
Tobacco
Vetch
Virginia bower
Virginia creeper
Wattle
White cedar
Wisteria
Yam bean
Yews
Yellow jasmine
Make sure any plants you put in have been washed off so they are free of pesticides.
*sorry for the long post*
