When it comes to little San Marzano tomatoes , there can be several agent at free rein . lease ’s research some potential reasons why your love apple may not be reaching their full size of it potential .

1 . Seed Quality : The quality of the seeds you start with is crucial . If you ’re using miserable - tone or former seed , they may not produce vigorous plants or large fruit . It ’s important to source your germ from a reputable provider who specialise in tomato seeds . Look for seeds that are certified organic and have high sprouting charge per unit .

2 . Plant Nutrition : Tomatoes are leaden feeders and demand a well - balanced diet to create large yield . If your grunge lack essential nutrients , it can stunt the growth of your tomatoes . acquit a soil test to find any nutrient deficiencies and amend the soil consequently . Providing a balanced plant food specifically formulated for tomatoes can help ensure they have the necessary nutrients for optimal growth .

3 . Watering Practices : Inconsistent lachrymation can guide to small Lycopersicon esculentum . tomato need consistent moisture , especially during the fruiting stage . Irregular lachrymation can have heyday terminal rot , a consideration where the bottoms of the fruit turn black and leathery . To prevent this , water your plant life deeply and evenly , assure the land is consistently moist but not waterlogged . Mulching around the plants can help retain wet and regulate soil temperature .

4 . Sunlight photograph : Tomatoes require full sun , which means they need at least six to eight hours of lineal sunshine each day . Insufficient sunlight can result in poor fruit growing and small tomatoes . Ensure your plant are not shaded by nearby trees or buildings . If you ’re acquire tomatoes in containers , turn over locomote them to a sunny location .

5 . crowd and Pruning : Overcrowded plants can lead to pocket-size fruit as they vie for resources . Give your San Marzano tomatoes ample space to grow by planting them at the recommended spacing . Additionally , proper pruning technique can aid kick upstairs tumid fruit . polish off any suckers ( shoots that form in the folio axil ) and focus on maintaining one or two main stems .

6 . Pest and Disease atmospheric pressure : pest and diseases can also affect the size of it of your tomatoes . Common culprits include aphids , tomato hornworms , and fungal diseases like other blight or powdery mold . Regularly scrutinize your plants for any signs of infestation or disease and take appropriate measure to control them . Using organic blighter control methods , such as handpicking plague or applying neem oil , can help forbid damage to your plant .

7 . Temperature extreme : Tomatoes thrive in temperate temperatures and can be negatively bear upon by extreme heat or inhuman . gamey temperature can deoxidise fruit set and cause smaller fruit , while inhuman temperatures can stunt growth . Consider providing wraith during red-hot summer days and using time of year extenders , such as words covers or cloches , to protect your industrial plant from early or late frosts .

By address these likely effect , you’re able to improve the size and quality of your San Marzano tomatoes . Remember to choose eminent - quality seed , ply proper nutriment and water , ensure enough sunlight , space out your plants , superintend pests and diseases , and protect your plants from temperature extremes . Happy horticulture !

Caroline Bates