It is illegal to carve your initials on a tree, even if it is on your own property.
Sec. 14-46. Obscene writing, defacing property. It shall be unlawful for any person to mark in obscene language, cut or otherwise deface any fence, house or tree in the city limits. (Code 1914, § 648)
Persons may not pick flowers from the city parks.
17-25 Flowers–Picking in parks, etc. No person shall pick any flower or flowers growing in any public park or place in the city, except by the express authorization of the superintendent thereof. (Code 1959, § 4240)
The Bluebonnet is the official song of the state flower.
Art. 6143bb. State Flower Song Resolved by the House of Representatives, the Senate concurring, That it adopt the Bluebonnet song as the State Flower Song. Acts 1933, 43rd Leg., p. 930, H.C.R. No. 24.
It is illegal to pick seaweed up off of the beach at night
TITLE XVIII FISH AND GAME CHAPTER 207 GENERAL PROVISIONS AS TO FISH AND GAME Collecting Seaweed Section 207:48 In Night. If any person shall carry away or collect for the purpose of carrying away any seaweed or rockweed from the seashore below high-water mark, between daylight in the evening and daylight in the morning, he…