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Horticultural Calendar for San Antonio, Austin and Surrounding Areas

Week 1-

Continue thinning bamboo groves of excess shoots and remove lower secondary branches from remaining stems to open views and provide access.

Last chance to sow: Bush Snap Beans, Cantaloupe, Cucumber, Hyacinth Bean, Okra, Squash, Sweet Corn and Watermelon.

Finish pruning all spring-flowering shrubs and vines.

Do not disturb the soil excessively where Johnny-jump-Up grew. The tiny seeds will germinate this fall if they are not too deep.

Optimal time for transplanting Madagascar Periwinkle (a.k.a. "Vinca"). The site should be in full sun, well-drained and NOT watered by a sprinkler system.

Week 2 -
Do not let Amaryllis or Daylilies form fruits. Cut them off! Seed production reduces future flowering.

Eradicate grass and maintain a six-foot circle of 4- to 6-inch-deep shredded hardwood mulch around young trees.  Competing with grass stunts them.

Re-apply Amaze or XL to keep Grassburs from sprouting.

Soak Perennial Hibiscus plants deeply every 10 days if  it is not raining.

Most pesticides should not be sprayed on Peaches within one week of harvest.

Week 3 -
Re-apply iron supplements (green sand, a.k.a. glauconite works great) to lawns and acid-loving shrubs and trees to avoid drought-stress chlorosis. Mulching those shrubs also helps.

Harvest Onions when their tops fall over. Sweet onions cannot be stored too long.

Control Leaf Roller Caterpillars on Cannas with a dust containing "Bt" (Bacillus thuringiensis).

Raise mower blades to summer mowing height (2.5- to 3-inches).

Week 4 -
Apply pyrethroid granules at base of Okra plants every 3 to 4 weeks (while they are flowering) to minimize fire ant damage.

Most well-established shrubs in mulched beds need to be watered deeply only every four weeks.

Water grass only when blades show signs of wilting in the morning. Avoid watering in the evenings, except where moronic watering restrictions force you to do otherwise.

Plant: Caesalpinia pulcherrima (Pride of Barbados), Clerodendrum ugandense (African Butterfly Bush), Erythrina crista galli (Fireman's Cap), Erythrina X bidwillii (Hybrid Coral Bean), Gomphrena, Hibiscus X 'Flare', Hibiscus X 'Lord Baltimore', variegated form of Manihot esculenta (Variegated Manioc, Variegated Tapioca) and Tecoma stans (Esperanza) for spectacular summer color.

Week 1-
Crepe Myrtles weekly for aphids or powdery mildew. Consider replacing with mildew-resistant varieties.

Minimize expensive foundation damage. During dry weather, water around the perimeter of your  slab-on-grade foundation every 2 to 3 weeks with a soaker hose.

If necessary, relocate spring-flowering bulbs, including perennial Daffodils, and replant immediately.

Finish pruning climbing Roses and all spring bloomers.

Harvest Garlic when "flower spike" starts to dry. Garlic without the spike should be ready in one more year.

Relocate all hanging baskets with sun-tolerant plants to a site which is shaded after 3:00 PM.

Remove spent flower spikes from all Salvias to encourage repeat blooming.

Week 2 -
Kill white fly, web worms and spider mites as soon as outbreaks occur.

Be careful near brush piles, weedy or overgrown areas and junk piles; a swarm of Africanized bees might lurk there.

Mow spring wildflowers after their seeds are mature.

Remove old, diseased Tomato, Pepper, Squash, etc. plants to clean up vegetable garden. Do NOT compost diseased plants.

Do not be a vector. Wash your hands after discarding virus-infected plants, and before touching disease-free plants.

Water young (less than two-years-old) trees and shrubs deeply every two weeks during a dry summer.

Week 3 -
Apply the first of two pyrethroid granule treatments for grubworm control in lawns  and beds. Use insecticidal granules only if you wish to also kill beneficial earthworms.

Remove and discard most Strawberry plants. Replant in early fall. Only the 'Selva' variety will bear in the summer.

This is a good time to prune Fig and Oleander and thin old wood on Pomegranate. Watch out for wasp nests.

Wear rubber gloves when harvesting the hottest of hot peppers: Dorset Naga, Naga Jolokia, Habanero, Red Savina, Scotch Bonnet, etc. Do not wipe your brow. If you do, you will soon experience a medical emergency.

Solarize your vegetable garden for the next three to four weeks.

Week 4 -
Tired of watering your lawn too frequently? Replace it with '609' or 'Stampede' Buffalograss in low-traffic sunny sites; 'El Toro' Zoysia in high-traffic full sun to part shade zones and 'Del-Mar' or 'Floratam' St. Augustine in shady areas with deep soils.

Control damaging insects on developing pecan nuts.

In case of very dry conditions, start watering your grounds to prevent fires caused by pyrotechnicians.

If you can reach them and if it is practical, remove Crepe Myrtle bloom spikes when half their flowers have lost their color.

Mulch all beds three- to four-inches-deep to keep soil cool, roots healthier, conserve moisture and reduce weed seed germination.

The botanical images on this site were produced by The Photon Hunt.

Thank you for visiting!,

seasonal notes

If you think our big freeze of mid February was extraordinary, read about the Maunder Minimum, Dalton Minimum and the new solar minimum and its chilling effects.

The current 11 year solar cycle, Cycle 25, began in 2020. The Dalton Minimum was from roughly from 1790 to 1830. The Maunder Minimum lasted from 1645 to 1710.

The following periodically have information on these topics:






Zharkova’s research predicts this Grand Solar Minimum started in 2020, and expects it to last until ca. 2053:

This is also interesting:
Assigning Blame for the Blackouts in Texas


Copyright at Common Law by Manuel Flores